Concept explainers
(a)
Interpretation:
The process of dissolving calcium chloride in water should be classified as a physical or chemical change.
Concept Introduction:
The process in which the chemical identity of a substance changes is said to be the chemical change whereas when the chemical identity of a substance does not change during a process then it is said to be a physical change.
(b)
Interpretation:
The process of burning gasoline to power a car should be classified as a physical or chemical change.
Concept Introduction:
The process in which the chemical identity of a substance changes is said to be the chemical change, whereas when the chemical identity of a substance does not change during a process then it is said to be a physical change.
(c)
Interpretation:
The process of melting of wax on heating should be classified as a physical or chemical change.
Concept Introduction:
The process in which the chemical identity of a substance changes is said to be the chemical change, whereas when the chemical identity of a substance does not change during a process then it is said to be a physical change.
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General, Organic, & Biological Chemistry
- Classify each of the following as (1) a physical property, (2) a physical change, (3) a chemical property, or (4) a chemical change. a. the process of burning a piece of newspaper b. the fact that metallic copper reacts with chlorine gas c. the process of melting ice d. the fact that metallic gold is a solid at room temperaturearrow_forwardWhich of the following represent physical properties or changes, and which represent chemical properties or changes? You curl your hair with a curling iron. You curl your hair by getting a “permanent wave” at the hair salon. Ice on your sidewalk melts when you put salt on it. A glass of water evaporates overnight when it is left on the bedside table. Your steak chars if the skillet is too hot. Alcohol feels cool when it is spilled on the skin. Alcohol ignites when a flame is brought near it. Baking powder causes biscuits to rise.arrow_forwardDecide whether each of the following is a physical property or a chemical property of the substance. a Salt substitute, potassium chloride, dissolves in water. b Seashells, calcium carbonate, fizz when immersed in vinegar. c The gas hydrogen sulfide smells like rotten eggs. d Fine steel wool (Fe) can be burned in air. e Pure water freezes at 0C.arrow_forward
- Which among the following are physical changes? a blowing glass; b fermenting grapes; c forming a snowflake; d evaporating dry ice; e decomposing a substance by heating it.arrow_forwardWhich of the following are chemical changes? Which are physical changes? a. the cutting of food b. interaction of food with saliva and digestive enzymes c. proteins being broken down into amino acids d. complex sugars being broken down into simple sugars e. making maple syrup by heating maple sap to remove water through evaporation f. DNA unwindingarrow_forwardIn each case, identify the italicized property as a physical or chemical property. Give a reason for your choice. The normal color of the element bromine is red-orange. Iron is transformed into rust in the presence of air and water. Dynamite can explode. Aluminum metal, the shiny “foil” you use in the kitchen, melts at 660 °C.arrow_forward
- 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.arrow_forwardClassify each of the following as a physical or chemical change, and give at least one observation, fact, or reason to support your answer. a. A stick is broken into two pieces. b. A candle burns. c. Rock salt is crushed by a hammer. d. Tree leaves change color in autumn.arrow_forwardIdentify the following properties as either extensive or intensive. volume temperature humidity heat boiling pointarrow_forward
- In each case, decide if the change is a chemical or physical change. (a) A cup of household bleach changes the color of your favorite T-shirt from purple to pink. (b) Water vapor in your exhaled breath condenses in the air on a cold day. (c) Plants use carbon dioxide from the air to make sugar. (d) Butter melts when placed in the Sun.arrow_forwardThe following are properties of substances. Decide whether each is a physical property or a chemical property. a Chlorine gas liquefies at 35C under normal pressure. b Hydrogen burns in chlorine gas. c Bromine melts at 7.2C. d Lithium is a soft, silvery-colored metal. e Iron rusts in an atmosphere of moist air.arrow_forwardDescribe a piece of ice at the particulate level. Then describe what happens to the ice as it is heated until it melts and eventually boils.arrow_forward
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