Classify each of the following as a physical or chemical change or property. Milk curdles if a few drops of lemon juice are added to it. Butter turns rancid if it is left exposed at room temperature. Salad dressing separates into layers after standing. Milk of magnesia neutralizes stomach acid. The steel in a car has rust spots. A person is asphyxiated by breathing carbon monoxide. Sulfuric acid spilled on a laboratory notebook page causes the paper to char and disintegrate. Sweat cools the body as the sweat evaporates from the skin. Aspirin reduces fever. Oil feels slippery. Alcohol hums, forming carbon dioxide and water.

Question

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Answer 1

Textbook Question

Chapter 3, Problem 49AP

Classify each of the following as aphysicalorchemicalchange or property.

Milk curdles if a few drops of lemon juice are added to it.

Butter turns rancid if it is left exposed at room temperature.

Salad dressing separates into layers after standing.

Milk of magnesia neutralizes stomach acid.

The steel in a car has rust spots.

A person is asphyxiated by breathing carbon monoxide.

Sulfuric acid spilled on a laboratory notebook page causes the paper to char and disintegrate.

Sweat cools the body as the sweat evaporates from the skin.

Aspirin reduces fever.

Oil feels slippery.

Alcohol hums, forming carbon dioxide and water.

Expert Solution

Interpretation Introduction

(a)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Milk curdles if a few drop of lemon juice are added to it.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Milk curdles if a few drops of lemon juice are added to it: chemical change.

Explanation of Solution

On adding the acid in lemon juice, the pH of milk drops, which causes the protein casein molecules to attract one another and form a clump. This curdling of milk is a chemical change which is accelerated in at warmer temperatures than at cold temperatures.

Expert Solution

Interpretation Introduction

(b)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Butter turns rancid if it is left exposed at room temperature.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Butter turns rancid if it is left exposed at room temperature: chemical change.

Explanation of Solution

Butter has fat in it and when fat undergoes oxidation reaction in air it produces a gas that is unpleasant smelling. This how butter turns rancid if it is left exposed at room temperature, which is a chemical change.

Expert Solution

Interpretation Introduction

(c)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Salad dressing separates into layers after standing.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Salad dressing separates into layers after standing: physical change .

Explanation of Solution

Salad dressing is made up on oil, vinegar, salt, pepper and water. Oil and water are immiscible; hence salad dressing separates into layers after standing. Salad dressing is a mixture and it separating into layers after standing is a physical change. There is no change in the chemical composition of the components of a salad dressing.

Expert Solution

Interpretation Introduction

(d)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Milk of magnesia neutralizes stomach acid.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Milk of magnesia neutralizes stomach acid: chemical change.

Explanation of Solution

Milk of magnesia is Mg(OH)₂, a base, which reacts with HCl in stomach to form a salt MgCl₂ Here there is formation of a new product. Hence, milk of magnesia neutralizing stomach acid is a chemical change.

Expert Solution

Interpretation Introduction

(e)

Interpretation:

Classify the following statement as a physical or chemical change or property.

The steel in a car has rust spots.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

The steel in a car has rust spots: chemical change.

Explanation of Solution

Rusting is a chemical redox reaction. Iron in the presence of oxygen in the air and water or air moisture gets converted to hydrated iron(III) oxides Fe₂ O.

Expert Solution

Interpretation Introduction

(f)

Interpretation:

Classify the following statement as a physical or chemical change or property.

A person is asphyxiated by breathing carbon monoxide.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

A person is asphyxiated by breathing carbon monoxide: chemical change.

Explanation of Solution

Carbon monoxide binds strongly and irreversibly to the heme protein in hemoglobin. As a result hemoglobin can no longer carry oxygen in the blood. So in the person of carbon monoxide hemoglobin undergoes a chemical change. Therefore, a person is asphyxiated by breathing carbon monoxide is a chemical change.

Expert Solution

Interpretation Introduction

(g)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Sulfuric acid spilled on a laboratory notebook page causes the paper to char and disintegrate.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Spilled acid burns a hole in cotton jeans: chemical change.

Explanation of Solution

Acids are corrosive and they can break the carbon carbon covalent bonds in cotton fabrics that jeans are made up of. So acids buring a hole in cotton jeans is a chemical change.

Expert Solution

Interpretation Introduction

(h)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Sweat cools the body as the sweat evaporates from the skin.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Sweat cools the body as the sweat evaporates from the skin: physical change.

Explanation of Solution

Sweat is in the liquid state. In order to evaporate or get transformed into vapor phase, sweat absorbs heat from the surrounding area on the skin, thereby cooling the whole body.

The transformation of sweat from liquid to gas phase is a physical change.

Expert Solution

Interpretation Introduction

(i)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Aspirin reduces fever.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Aspirin reduces fever: chemical change.

Explanation of Solution

Aspirin binds to an enzyme COX and inhibits it. Thus preventing COX from producing a high level of prostaglandin, which is an inflammatory agent. Prostaglandin levels are high during and aspirin works to reduce the level of prostaglandin thus reducing pain and inflammation during fever.

Expert Solution

Interpretation Introduction

(j)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Oil feels slippery.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Oil feels slippery: physical change.

Explanation of Solution

Slipperiness of oil is its physical property. There is no change in the chemical composition of the oil.

Expert Solution

Interpretation Introduction

(k)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Alcohol burns, forming carbon dioxide and water.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Alcohol burns, forming carbon dioxide and water: chemical change.

Explanation of Solution

Combustion of alcohol is a chemical change because after burning alcohol no longer exists but all of it gets converted to carbon dioxide and water.

C₂ H₅ OH + 3 O₂ = 2 CO₂ + 3 H₂ O.

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Students have asked these similar questions

Electron pushing arrows showing the flow of electrons?

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3. Propose a synthesis for the following transformation. Do not draw an arrow-pushing mechanism below, but make sure to draw the product of each proposed step (3 points). CN + En CN

Answer 2

Textbook Question

Chapter 3, Problem 49AP

Classify each of the following as aphysicalorchemicalchange or property.

Milk curdles if a few drops of lemon juice are added to it.

Butter turns rancid if it is left exposed at room temperature.

Salad dressing separates into layers after standing.

Milk of magnesia neutralizes stomach acid.

The steel in a car has rust spots.

A person is asphyxiated by breathing carbon monoxide.

Sulfuric acid spilled on a laboratory notebook page causes the paper to char and disintegrate.

Sweat cools the body as the sweat evaporates from the skin.

Aspirin reduces fever.

Oil feels slippery.

Alcohol hums, forming carbon dioxide and water.

Expert Solution

Interpretation Introduction

(a)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Milk curdles if a few drop of lemon juice are added to it.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Milk curdles if a few drops of lemon juice are added to it: chemical change.

Explanation of Solution

On adding the acid in lemon juice, the pH of milk drops, which causes the protein casein molecules to attract one another and form a clump. This curdling of milk is a chemical change which is accelerated in at warmer temperatures than at cold temperatures.

Expert Solution

Interpretation Introduction

(b)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Butter turns rancid if it is left exposed at room temperature.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Butter turns rancid if it is left exposed at room temperature: chemical change.

Explanation of Solution

Butter has fat in it and when fat undergoes oxidation reaction in air it produces a gas that is unpleasant smelling. This how butter turns rancid if it is left exposed at room temperature, which is a chemical change.

Expert Solution

Interpretation Introduction

(c)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Salad dressing separates into layers after standing.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Salad dressing separates into layers after standing: physical change .

Explanation of Solution

Salad dressing is made up on oil, vinegar, salt, pepper and water. Oil and water are immiscible; hence salad dressing separates into layers after standing. Salad dressing is a mixture and it separating into layers after standing is a physical change. There is no change in the chemical composition of the components of a salad dressing.

Expert Solution

Interpretation Introduction

(d)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Milk of magnesia neutralizes stomach acid.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Milk of magnesia neutralizes stomach acid: chemical change.

Explanation of Solution

Milk of magnesia is Mg(OH)₂, a base, which reacts with HCl in stomach to form a salt MgCl₂ Here there is formation of a new product. Hence, milk of magnesia neutralizing stomach acid is a chemical change.

Expert Solution

Interpretation Introduction

(e)

Interpretation:

Classify the following statement as a physical or chemical change or property.

The steel in a car has rust spots.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

The steel in a car has rust spots: chemical change.

Explanation of Solution

Rusting is a chemical redox reaction. Iron in the presence of oxygen in the air and water or air moisture gets converted to hydrated iron(III) oxides Fe₂ O.

Expert Solution

Interpretation Introduction

(f)

Interpretation:

Classify the following statement as a physical or chemical change or property.

A person is asphyxiated by breathing carbon monoxide.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

A person is asphyxiated by breathing carbon monoxide: chemical change.

Explanation of Solution

Carbon monoxide binds strongly and irreversibly to the heme protein in hemoglobin. As a result hemoglobin can no longer carry oxygen in the blood. So in the person of carbon monoxide hemoglobin undergoes a chemical change. Therefore, a person is asphyxiated by breathing carbon monoxide is a chemical change.

Expert Solution

Interpretation Introduction

(g)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Sulfuric acid spilled on a laboratory notebook page causes the paper to char and disintegrate.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Spilled acid burns a hole in cotton jeans: chemical change.

Explanation of Solution

Acids are corrosive and they can break the carbon carbon covalent bonds in cotton fabrics that jeans are made up of. So acids buring a hole in cotton jeans is a chemical change.

Expert Solution

Interpretation Introduction

(h)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Sweat cools the body as the sweat evaporates from the skin.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Sweat cools the body as the sweat evaporates from the skin: physical change.

Explanation of Solution

Sweat is in the liquid state. In order to evaporate or get transformed into vapor phase, sweat absorbs heat from the surrounding area on the skin, thereby cooling the whole body.

The transformation of sweat from liquid to gas phase is a physical change.

Expert Solution

Interpretation Introduction

(i)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Aspirin reduces fever.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Aspirin reduces fever: chemical change.

Explanation of Solution

Aspirin binds to an enzyme COX and inhibits it. Thus preventing COX from producing a high level of prostaglandin, which is an inflammatory agent. Prostaglandin levels are high during and aspirin works to reduce the level of prostaglandin thus reducing pain and inflammation during fever.

Expert Solution

Interpretation Introduction

(j)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Oil feels slippery.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Oil feels slippery: physical change.

Explanation of Solution

Slipperiness of oil is its physical property. There is no change in the chemical composition of the oil.

Expert Solution

Interpretation Introduction

(k)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Alcohol burns, forming carbon dioxide and water.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Alcohol burns, forming carbon dioxide and water: chemical change.

Explanation of Solution

Combustion of alcohol is a chemical change because after burning alcohol no longer exists but all of it gets converted to carbon dioxide and water.

C₂ H₅ OH + 3 O₂ = 2 CO₂ + 3 H₂ O.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 3

Textbook Question

Chapter 3, Problem 49AP

Classify each of the following as aphysicalorchemicalchange or property.

Milk curdles if a few drops of lemon juice are added to it.

Butter turns rancid if it is left exposed at room temperature.

Salad dressing separates into layers after standing.

Milk of magnesia neutralizes stomach acid.

The steel in a car has rust spots.

A person is asphyxiated by breathing carbon monoxide.

Sulfuric acid spilled on a laboratory notebook page causes the paper to char and disintegrate.

Sweat cools the body as the sweat evaporates from the skin.

Aspirin reduces fever.

Oil feels slippery.

Alcohol hums, forming carbon dioxide and water.

Expert Solution

Interpretation Introduction

(a)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Milk curdles if a few drop of lemon juice are added to it.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Milk curdles if a few drops of lemon juice are added to it: chemical change.

Explanation of Solution

On adding the acid in lemon juice, the pH of milk drops, which causes the protein casein molecules to attract one another and form a clump. This curdling of milk is a chemical change which is accelerated in at warmer temperatures than at cold temperatures.

Expert Solution

Interpretation Introduction

(b)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Butter turns rancid if it is left exposed at room temperature.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Butter turns rancid if it is left exposed at room temperature: chemical change.

Explanation of Solution

Butter has fat in it and when fat undergoes oxidation reaction in air it produces a gas that is unpleasant smelling. This how butter turns rancid if it is left exposed at room temperature, which is a chemical change.

Expert Solution

Interpretation Introduction

(c)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Salad dressing separates into layers after standing.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Salad dressing separates into layers after standing: physical change .

Explanation of Solution

Salad dressing is made up on oil, vinegar, salt, pepper and water. Oil and water are immiscible; hence salad dressing separates into layers after standing. Salad dressing is a mixture and it separating into layers after standing is a physical change. There is no change in the chemical composition of the components of a salad dressing.

Expert Solution

Interpretation Introduction

(d)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Milk of magnesia neutralizes stomach acid.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Milk of magnesia neutralizes stomach acid: chemical change.

Explanation of Solution

Milk of magnesia is Mg(OH)₂, a base, which reacts with HCl in stomach to form a salt MgCl₂ Here there is formation of a new product. Hence, milk of magnesia neutralizing stomach acid is a chemical change.

Expert Solution

Interpretation Introduction

(e)

Interpretation:

Classify the following statement as a physical or chemical change or property.

The steel in a car has rust spots.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

The steel in a car has rust spots: chemical change.

Explanation of Solution

Rusting is a chemical redox reaction. Iron in the presence of oxygen in the air and water or air moisture gets converted to hydrated iron(III) oxides Fe₂ O.

Expert Solution

Interpretation Introduction

(f)

Interpretation:

Classify the following statement as a physical or chemical change or property.

A person is asphyxiated by breathing carbon monoxide.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

A person is asphyxiated by breathing carbon monoxide: chemical change.

Explanation of Solution

Carbon monoxide binds strongly and irreversibly to the heme protein in hemoglobin. As a result hemoglobin can no longer carry oxygen in the blood. So in the person of carbon monoxide hemoglobin undergoes a chemical change. Therefore, a person is asphyxiated by breathing carbon monoxide is a chemical change.

Expert Solution

Interpretation Introduction

(g)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Sulfuric acid spilled on a laboratory notebook page causes the paper to char and disintegrate.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Spilled acid burns a hole in cotton jeans: chemical change.

Explanation of Solution

Acids are corrosive and they can break the carbon carbon covalent bonds in cotton fabrics that jeans are made up of. So acids buring a hole in cotton jeans is a chemical change.

Expert Solution

Interpretation Introduction

(h)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Sweat cools the body as the sweat evaporates from the skin.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Sweat cools the body as the sweat evaporates from the skin: physical change.

Explanation of Solution

Sweat is in the liquid state. In order to evaporate or get transformed into vapor phase, sweat absorbs heat from the surrounding area on the skin, thereby cooling the whole body.

The transformation of sweat from liquid to gas phase is a physical change.

Expert Solution

Interpretation Introduction

(i)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Aspirin reduces fever.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Aspirin reduces fever: chemical change.

Explanation of Solution

Aspirin binds to an enzyme COX and inhibits it. Thus preventing COX from producing a high level of prostaglandin, which is an inflammatory agent. Prostaglandin levels are high during and aspirin works to reduce the level of prostaglandin thus reducing pain and inflammation during fever.

Expert Solution

Interpretation Introduction

(j)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Oil feels slippery.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Oil feels slippery: physical change.

Explanation of Solution

Slipperiness of oil is its physical property. There is no change in the chemical composition of the oil.

Expert Solution

Interpretation Introduction

(k)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Alcohol burns, forming carbon dioxide and water.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Alcohol burns, forming carbon dioxide and water: chemical change.

Explanation of Solution

Combustion of alcohol is a chemical change because after burning alcohol no longer exists but all of it gets converted to carbon dioxide and water.

C₂ H₅ OH + 3 O₂ = 2 CO₂ + 3 H₂ O.

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Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 4

Textbook Question

Chapter 3, Problem 49AP

Classify each of the following as aphysicalorchemicalchange or property.

Milk curdles if a few drops of lemon juice are added to it.

Butter turns rancid if it is left exposed at room temperature.

Salad dressing separates into layers after standing.

Milk of magnesia neutralizes stomach acid.

The steel in a car has rust spots.

A person is asphyxiated by breathing carbon monoxide.

Sulfuric acid spilled on a laboratory notebook page causes the paper to char and disintegrate.

Sweat cools the body as the sweat evaporates from the skin.

Aspirin reduces fever.

Oil feels slippery.

Alcohol hums, forming carbon dioxide and water.

Expert Solution

Interpretation Introduction

(a)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Milk curdles if a few drop of lemon juice are added to it.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Milk curdles if a few drops of lemon juice are added to it: chemical change.

Explanation of Solution

On adding the acid in lemon juice, the pH of milk drops, which causes the protein casein molecules to attract one another and form a clump. This curdling of milk is a chemical change which is accelerated in at warmer temperatures than at cold temperatures.

Expert Solution

Interpretation Introduction

(b)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Butter turns rancid if it is left exposed at room temperature.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Butter turns rancid if it is left exposed at room temperature: chemical change.

Explanation of Solution

Butter has fat in it and when fat undergoes oxidation reaction in air it produces a gas that is unpleasant smelling. This how butter turns rancid if it is left exposed at room temperature, which is a chemical change.

Expert Solution

Interpretation Introduction

(c)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Salad dressing separates into layers after standing.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Salad dressing separates into layers after standing: physical change .

Explanation of Solution

Salad dressing is made up on oil, vinegar, salt, pepper and water. Oil and water are immiscible; hence salad dressing separates into layers after standing. Salad dressing is a mixture and it separating into layers after standing is a physical change. There is no change in the chemical composition of the components of a salad dressing.

Expert Solution

Interpretation Introduction

(d)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Milk of magnesia neutralizes stomach acid.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Milk of magnesia neutralizes stomach acid: chemical change.

Explanation of Solution

Milk of magnesia is Mg(OH)₂, a base, which reacts with HCl in stomach to form a salt MgCl₂ Here there is formation of a new product. Hence, milk of magnesia neutralizing stomach acid is a chemical change.

Expert Solution

Interpretation Introduction

(e)

Interpretation:

Classify the following statement as a physical or chemical change or property.

The steel in a car has rust spots.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

The steel in a car has rust spots: chemical change.

Explanation of Solution

Rusting is a chemical redox reaction. Iron in the presence of oxygen in the air and water or air moisture gets converted to hydrated iron(III) oxides Fe₂ O.

Expert Solution

Interpretation Introduction

(f)

Interpretation:

Classify the following statement as a physical or chemical change or property.

A person is asphyxiated by breathing carbon monoxide.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

A person is asphyxiated by breathing carbon monoxide: chemical change.

Explanation of Solution

Carbon monoxide binds strongly and irreversibly to the heme protein in hemoglobin. As a result hemoglobin can no longer carry oxygen in the blood. So in the person of carbon monoxide hemoglobin undergoes a chemical change. Therefore, a person is asphyxiated by breathing carbon monoxide is a chemical change.

Expert Solution

Interpretation Introduction

(g)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Sulfuric acid spilled on a laboratory notebook page causes the paper to char and disintegrate.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Spilled acid burns a hole in cotton jeans: chemical change.

Explanation of Solution

Acids are corrosive and they can break the carbon carbon covalent bonds in cotton fabrics that jeans are made up of. So acids buring a hole in cotton jeans is a chemical change.

Expert Solution

Interpretation Introduction

(h)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Sweat cools the body as the sweat evaporates from the skin.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Sweat cools the body as the sweat evaporates from the skin: physical change.

Explanation of Solution

Sweat is in the liquid state. In order to evaporate or get transformed into vapor phase, sweat absorbs heat from the surrounding area on the skin, thereby cooling the whole body.

The transformation of sweat from liquid to gas phase is a physical change.

Expert Solution

Interpretation Introduction

(i)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Aspirin reduces fever.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Aspirin reduces fever: chemical change.

Explanation of Solution

Aspirin binds to an enzyme COX and inhibits it. Thus preventing COX from producing a high level of prostaglandin, which is an inflammatory agent. Prostaglandin levels are high during and aspirin works to reduce the level of prostaglandin thus reducing pain and inflammation during fever.

Expert Solution

Interpretation Introduction

(j)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Oil feels slippery.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Oil feels slippery: physical change.

Explanation of Solution

Slipperiness of oil is its physical property. There is no change in the chemical composition of the oil.

Expert Solution

Interpretation Introduction

(k)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Alcohol burns, forming carbon dioxide and water.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Alcohol burns, forming carbon dioxide and water: chemical change.

Explanation of Solution

Combustion of alcohol is a chemical change because after burning alcohol no longer exists but all of it gets converted to carbon dioxide and water.

C₂ H₅ OH + 3 O₂ = 2 CO₂ + 3 H₂ O.

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Answer 5

Textbook Question

Answer 6

Textbook Question

Answer 7

Expert Solution

Interpretation Introduction

(a)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Milk curdles if a few drop of lemon juice are added to it.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Milk curdles if a few drops of lemon juice are added to it: chemical change.

Explanation of Solution

On adding the acid in lemon juice, the pH of milk drops, which causes the protein casein molecules to attract one another and form a clump. This curdling of milk is a chemical change which is accelerated in at warmer temperatures than at cold temperatures.

Expert Solution

Interpretation Introduction

(b)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Butter turns rancid if it is left exposed at room temperature.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Butter turns rancid if it is left exposed at room temperature: chemical change.

Explanation of Solution

Butter has fat in it and when fat undergoes oxidation reaction in air it produces a gas that is unpleasant smelling. This how butter turns rancid if it is left exposed at room temperature, which is a chemical change.

Expert Solution

Interpretation Introduction

(c)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Salad dressing separates into layers after standing.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Salad dressing separates into layers after standing: physical change .

Explanation of Solution

Salad dressing is made up on oil, vinegar, salt, pepper and water. Oil and water are immiscible; hence salad dressing separates into layers after standing. Salad dressing is a mixture and it separating into layers after standing is a physical change. There is no change in the chemical composition of the components of a salad dressing.

Expert Solution

Interpretation Introduction

(d)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Milk of magnesia neutralizes stomach acid.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Milk of magnesia neutralizes stomach acid: chemical change.

Explanation of Solution

Milk of magnesia is Mg(OH)₂, a base, which reacts with HCl in stomach to form a salt MgCl₂ Here there is formation of a new product. Hence, milk of magnesia neutralizing stomach acid is a chemical change.

Expert Solution

Interpretation Introduction

(e)

Interpretation:

Classify the following statement as a physical or chemical change or property.

The steel in a car has rust spots.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

The steel in a car has rust spots: chemical change.

Explanation of Solution

Rusting is a chemical redox reaction. Iron in the presence of oxygen in the air and water or air moisture gets converted to hydrated iron(III) oxides Fe₂ O.

Expert Solution

Interpretation Introduction

(f)

Interpretation:

Classify the following statement as a physical or chemical change or property.

A person is asphyxiated by breathing carbon monoxide.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

A person is asphyxiated by breathing carbon monoxide: chemical change.

Explanation of Solution

Carbon monoxide binds strongly and irreversibly to the heme protein in hemoglobin. As a result hemoglobin can no longer carry oxygen in the blood. So in the person of carbon monoxide hemoglobin undergoes a chemical change. Therefore, a person is asphyxiated by breathing carbon monoxide is a chemical change.

Expert Solution

Interpretation Introduction

(g)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Sulfuric acid spilled on a laboratory notebook page causes the paper to char and disintegrate.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Spilled acid burns a hole in cotton jeans: chemical change.

Explanation of Solution

Acids are corrosive and they can break the carbon carbon covalent bonds in cotton fabrics that jeans are made up of. So acids buring a hole in cotton jeans is a chemical change.

Expert Solution

Interpretation Introduction

(h)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Sweat cools the body as the sweat evaporates from the skin.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Sweat cools the body as the sweat evaporates from the skin: physical change.

Explanation of Solution

Sweat is in the liquid state. In order to evaporate or get transformed into vapor phase, sweat absorbs heat from the surrounding area on the skin, thereby cooling the whole body.

The transformation of sweat from liquid to gas phase is a physical change.

Expert Solution

Interpretation Introduction

(i)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Aspirin reduces fever.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Aspirin reduces fever: chemical change.

Explanation of Solution

Aspirin binds to an enzyme COX and inhibits it. Thus preventing COX from producing a high level of prostaglandin, which is an inflammatory agent. Prostaglandin levels are high during and aspirin works to reduce the level of prostaglandin thus reducing pain and inflammation during fever.

Expert Solution

Interpretation Introduction

(j)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Oil feels slippery.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Oil feels slippery: physical change.

Explanation of Solution

Slipperiness of oil is its physical property. There is no change in the chemical composition of the oil.

Expert Solution

Interpretation Introduction

(k)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Alcohol burns, forming carbon dioxide and water.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Alcohol burns, forming carbon dioxide and water: chemical change.

Explanation of Solution

Combustion of alcohol is a chemical change because after burning alcohol no longer exists but all of it gets converted to carbon dioxide and water.

C₂ H₅ OH + 3 O₂ = 2 CO₂ + 3 H₂ O.

Answer 8

Expert Solution

Interpretation Introduction

(a)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Milk curdles if a few drop of lemon juice are added to it.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Milk curdles if a few drops of lemon juice are added to it: chemical change.

Explanation of Solution

On adding the acid in lemon juice, the pH of milk drops, which causes the protein casein molecules to attract one another and form a clump. This curdling of milk is a chemical change which is accelerated in at warmer temperatures than at cold temperatures.

Answer 9

Expert Solution

Answer 10

Expert Solution

Answer 11

Expert Solution

Answer 12

Interpretation Introduction

(a)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Milk curdles if a few drop of lemon juice are added to it.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer 13

Answer to Problem 49AP

Milk curdles if a few drops of lemon juice are added to it: chemical change.

Answer 14

Explanation of Solution

On adding the acid in lemon juice, the pH of milk drops, which causes the protein casein molecules to attract one another and form a clump. This curdling of milk is a chemical change which is accelerated in at warmer temperatures than at cold temperatures.

Answer 15

Expert Solution

Interpretation Introduction

(b)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Butter turns rancid if it is left exposed at room temperature.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Butter turns rancid if it is left exposed at room temperature: chemical change.

Explanation of Solution

Butter has fat in it and when fat undergoes oxidation reaction in air it produces a gas that is unpleasant smelling. This how butter turns rancid if it is left exposed at room temperature, which is a chemical change.

Answer 16

Expert Solution

Answer 17

Expert Solution

Answer 18

Expert Solution

Answer 19

Interpretation Introduction

(b)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Butter turns rancid if it is left exposed at room temperature.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer 20

Answer to Problem 49AP

Butter turns rancid if it is left exposed at room temperature: chemical change.

Answer 21

Explanation of Solution

Butter has fat in it and when fat undergoes oxidation reaction in air it produces a gas that is unpleasant smelling. This how butter turns rancid if it is left exposed at room temperature, which is a chemical change.

Answer 22

Expert Solution

Interpretation Introduction

(c)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Salad dressing separates into layers after standing.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Salad dressing separates into layers after standing: physical change .

Explanation of Solution

Salad dressing is made up on oil, vinegar, salt, pepper and water. Oil and water are immiscible; hence salad dressing separates into layers after standing. Salad dressing is a mixture and it separating into layers after standing is a physical change. There is no change in the chemical composition of the components of a salad dressing.

Answer 23

Expert Solution

Answer 24

Expert Solution

Answer 25

Expert Solution

Answer 26

Interpretation Introduction

(c)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Salad dressing separates into layers after standing.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer 27

Answer to Problem 49AP

Salad dressing separates into layers after standing: physical change .

Answer 28

Explanation of Solution

Salad dressing is made up on oil, vinegar, salt, pepper and water. Oil and water are immiscible; hence salad dressing separates into layers after standing. Salad dressing is a mixture and it separating into layers after standing is a physical change. There is no change in the chemical composition of the components of a salad dressing.

Answer 29

Expert Solution

Interpretation Introduction

(d)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Milk of magnesia neutralizes stomach acid.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Milk of magnesia neutralizes stomach acid: chemical change.

Explanation of Solution

Milk of magnesia is Mg(OH)₂, a base, which reacts with HCl in stomach to form a salt MgCl₂ Here there is formation of a new product. Hence, milk of magnesia neutralizing stomach acid is a chemical change.

Answer 30

Expert Solution

Answer 31

Expert Solution

Answer 32

Expert Solution

Answer 33

Interpretation Introduction

(d)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Milk of magnesia neutralizes stomach acid.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer 34

Answer to Problem 49AP

Milk of magnesia neutralizes stomach acid: chemical change.

Answer 35

Explanation of Solution

Milk of magnesia is Mg(OH)₂, a base, which reacts with HCl in stomach to form a salt MgCl₂ Here there is formation of a new product. Hence, milk of magnesia neutralizing stomach acid is a chemical change.

Answer 36

Expert Solution

Interpretation Introduction

(e)

Interpretation:

Classify the following statement as a physical or chemical change or property.

The steel in a car has rust spots.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

The steel in a car has rust spots: chemical change.

Explanation of Solution

Rusting is a chemical redox reaction. Iron in the presence of oxygen in the air and water or air moisture gets converted to hydrated iron(III) oxides Fe₂ O.

Answer 37

Expert Solution

Answer 38

Expert Solution

Answer 39

Expert Solution

Answer 40

Interpretation Introduction

(e)

Interpretation:

Classify the following statement as a physical or chemical change or property.

The steel in a car has rust spots.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer 41

Answer to Problem 49AP

The steel in a car has rust spots: chemical change.

Answer 42

Explanation of Solution

Rusting is a chemical redox reaction. Iron in the presence of oxygen in the air and water or air moisture gets converted to hydrated iron(III) oxides Fe₂ O.

Answer 43

Expert Solution

Interpretation Introduction

(f)

Interpretation:

Classify the following statement as a physical or chemical change or property.

A person is asphyxiated by breathing carbon monoxide.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

A person is asphyxiated by breathing carbon monoxide: chemical change.

Explanation of Solution

Carbon monoxide binds strongly and irreversibly to the heme protein in hemoglobin. As a result hemoglobin can no longer carry oxygen in the blood. So in the person of carbon monoxide hemoglobin undergoes a chemical change. Therefore, a person is asphyxiated by breathing carbon monoxide is a chemical change.

Answer 44

Expert Solution

Answer 45

Expert Solution

Answer 46

Expert Solution

Answer 47

Interpretation Introduction

(f)

Interpretation:

Classify the following statement as a physical or chemical change or property.

A person is asphyxiated by breathing carbon monoxide.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer 48

Answer to Problem 49AP

A person is asphyxiated by breathing carbon monoxide: chemical change.

Answer 49

Explanation of Solution

Carbon monoxide binds strongly and irreversibly to the heme protein in hemoglobin. As a result hemoglobin can no longer carry oxygen in the blood. So in the person of carbon monoxide hemoglobin undergoes a chemical change. Therefore, a person is asphyxiated by breathing carbon monoxide is a chemical change.

Answer 50

Expert Solution

Interpretation Introduction

(g)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Sulfuric acid spilled on a laboratory notebook page causes the paper to char and disintegrate.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Spilled acid burns a hole in cotton jeans: chemical change.

Explanation of Solution

Acids are corrosive and they can break the carbon carbon covalent bonds in cotton fabrics that jeans are made up of. So acids buring a hole in cotton jeans is a chemical change.

Answer 51

Expert Solution

Answer 52

Expert Solution

Answer 53

Expert Solution

Answer 54

Interpretation Introduction

(g)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Sulfuric acid spilled on a laboratory notebook page causes the paper to char and disintegrate.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer 55

Answer to Problem 49AP

Spilled acid burns a hole in cotton jeans: chemical change.

Answer 56

Explanation of Solution

Acids are corrosive and they can break the carbon carbon covalent bonds in cotton fabrics that jeans are made up of. So acids buring a hole in cotton jeans is a chemical change.

Answer 57

Expert Solution

Interpretation Introduction

(h)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Sweat cools the body as the sweat evaporates from the skin.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Sweat cools the body as the sweat evaporates from the skin: physical change.

Explanation of Solution

Sweat is in the liquid state. In order to evaporate or get transformed into vapor phase, sweat absorbs heat from the surrounding area on the skin, thereby cooling the whole body.

The transformation of sweat from liquid to gas phase is a physical change.

Answer 58

Expert Solution

Answer 59

Expert Solution

Answer 60

Expert Solution

Answer 61

Interpretation Introduction

(h)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Sweat cools the body as the sweat evaporates from the skin.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer 62

Answer to Problem 49AP

Sweat cools the body as the sweat evaporates from the skin: physical change.

Answer 63

Explanation of Solution

Sweat is in the liquid state. In order to evaporate or get transformed into vapor phase, sweat absorbs heat from the surrounding area on the skin, thereby cooling the whole body.

The transformation of sweat from liquid to gas phase is a physical change.

Answer 64

Expert Solution

Interpretation Introduction

(i)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Aspirin reduces fever.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Aspirin reduces fever: chemical change.

Explanation of Solution

Aspirin binds to an enzyme COX and inhibits it. Thus preventing COX from producing a high level of prostaglandin, which is an inflammatory agent. Prostaglandin levels are high during and aspirin works to reduce the level of prostaglandin thus reducing pain and inflammation during fever.

Answer 65

Expert Solution

Answer 66

Expert Solution

Answer 67

Expert Solution

Answer 68

Interpretation Introduction

(i)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Aspirin reduces fever.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer 69

Answer to Problem 49AP

Aspirin reduces fever: chemical change.

Answer 70

Explanation of Solution

Aspirin binds to an enzyme COX and inhibits it. Thus preventing COX from producing a high level of prostaglandin, which is an inflammatory agent. Prostaglandin levels are high during and aspirin works to reduce the level of prostaglandin thus reducing pain and inflammation during fever.

Answer 71

Expert Solution

Interpretation Introduction

(j)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Oil feels slippery.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Oil feels slippery: physical change.

Explanation of Solution

Slipperiness of oil is its physical property. There is no change in the chemical composition of the oil.

Answer 72

Expert Solution

Answer 73

Expert Solution

Answer 74

Expert Solution

Answer 75

Interpretation Introduction

(j)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Oil feels slippery.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer 76

Answer to Problem 49AP

Oil feels slippery: physical change.

Answer 77

Explanation of Solution

Slipperiness of oil is its physical property. There is no change in the chemical composition of the oil.

Answer 78

Expert Solution

Interpretation Introduction

(k)

Interpretation:

Classify the following statement as a physical or chemical change or property.

Alcohol burns, forming carbon dioxide and water.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.

Answer to Problem 49AP

Alcohol burns, forming carbon dioxide and water: chemical change.

Explanation of Solution

Combustion of alcohol is a chemical change because after burning alcohol no longer exists but all of it gets converted to carbon dioxide and water.

C₂ H₅ OH + 3 O₂ = 2 CO₂ + 3 H₂ O.

Answer 79

Expert Solution

Answer 80

Expert Solution

Answer 81

Expert Solution

Answer 82

Interpretation Introduction

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Interpretation:

Classify the following statement as a physical or chemical change or property.

Alcohol burns, forming carbon dioxide and water.

Concept Introduction:

Chemical change occurs in a chemical reaction where there is a change in the chemical composition of the substance. In a physical change, there is no change in the chemical composition of the substance but there is a change in the odor, color, melting point etc. of the substance.