(a)
Interpretation: The observation during the given chemical change to support the fact needs to be described.
An antacid tablet was dropped into water.
Concept Introduction: When a substance changes its appearance or change in the state takes place and there is no change in its chemical composition, the change is said to be physical. On the other hand, when there is a change in the chemical composition of a substance or a new substance is formed after a
(a)
Explanation of Solution
When the antacid tablet is dropped in water, it gets dissolved in it. Antacid tablets contain sodium bicarbonate which reacts with hydrogen ions in the water to form carbon dioxide. This carbon dioxide formation causes effervescence in water and gives a clue of chemical change.
(b)
Interpretation: The observation during the given chemical change to support the fact needs to be described.
A ring of scum forms around a bathtub
Concept Introduction: When a substance changes its appearance or change in the state takes place and there is no change in its chemical composition, the change is said to be physical. On the other hand, when there is a change in the chemical composition of a substance or a new substance is formed after a chemical reaction, it is known as a chemical change.
(b)
Explanation of Solution
The formation of a ring of scum around a bathtub is due to a precipitation reaction. Here, the formation of a solid that settles out of a liquid mixture cause formation of a ring of scum. Thus, the formation of precipitate shows there is a chemical change.
(c)
Interpretation: The observation during the given chemical change to support the fact needs to be described.
Rusting of iron
Concept Introduction: When a substance changes its appearance or change in the state takes place and there is no change in its chemical composition, the change is said to be physical. On the other hand, when there is a change in the chemical composition of a substance or a new substance is formed after a chemical reaction, it is known as a chemical change.
(c)
Explanation of Solution
Rusting of iron is due to corrosion when the iron is exposed to moisture in the air. This results in the formation of iron oxide. Here, a new substance is formed thus, it is a chemical change. Iron oxide so formed is reddish-brown and also known as rust.
(d)
Interpretation: The observation during the given chemical change to support the fact needs to be described.
Explosion of firecracker
Concept Introduction: When a substance changes its appearance or change in the state takes place and there is no change in its chemical composition, the change is said to be physical. On the other hand, when there is a change in the chemical composition of a substance or a new substance is formed after a chemical reaction, it is known as a chemical change.
(d)
Explanation of Solution
The explosion of a firecracker involves the production of heat, light, and sound. The explosion of the firecracker results in an exothermic
(e)
Interpretation: The observation during the given chemical change to support the fact needs to be described.
Formation of bubbles when hydrogen peroxide is poured onto an open wound.
Concept Introduction: When a substance changes its appearance or change in the state takes place and there is no change in its chemical composition, the change is said to be physical. On the other hand, when there is a change in the chemical composition of a substance or a new substance is formed after a chemical reaction, it is known as a chemical change.
(e)
Explanation of Solution
When hydrogen peroxide is poured onto an open wound, the formation of bubbles shows a chemical reaction. The bubbles are due to the release of oxygen gas. Here, oxygen gas is produced due to the breaking of hydrogen peroxide in the presence of enzyme catalyzes.
(f)
Interpretation: The observation during the given chemical change to support the fact needs to be described.
Cooking a hamburger.
Concept Introduction: When a substance changes its appearance or change in the state takes place and there is no change in its chemical composition, the change is said to be physical. On the other hand, when there is a change in the chemical composition of a substance or a new substance is formed after a chemical reaction, it is known as a chemical change.
(f)
Explanation of Solution
When a hamburger is cooked, a new substance is formed from raw materials. Here, new species are formed which cannot be converted back into original ingredients thus, it is a chemical change.
Chapter 2 Solutions
Chemistry 2012 Student Edition (hard Cover) Grade 11
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- Using line angle formulas, draw thestructures of and name four alkanes that have total of 7carbons, one of which is tertiary.Please explain this in detail and can you also explain how to approach a similar problem like this as well?arrow_forwardUsing dashed line wedge projections drawthe indicated compounds and indicate whether thecompound you have drawn is R or S.(a) The two enantiomers of 2-chlorobutane. Can you please explain your steps and how you would approach a similar problem. Thank you!arrow_forward5) There are no lone pairs shown in the structure below. Please add in all lone pairs and then give the hybridization scheme for the compound. (8) 10,11 7) 1.2.3 H 4 | 14 8) COC 12 13 H 16 15 H7 9) - 5.6 C 8 H 10) H 1). 2) 3)_ 11) 12) 13) 4)_ 14) 5) 15) 16) 6)arrow_forward
- The sum of the numbers in the name of isA. 11; B. 13; C. 10; D. 12; E. none of the other answers iscorrect. I believe the awnser should be E to this problem but the solution to this problem is D 12. I'm honestly unsure how that's the solution. If you can please explain the steps to this type of problem and how to approach a problem like this it would be greatly appreciated!arrow_forwardConsider the following data for phosphorus: g atomic mass 30.974 mol electronegativity 2.19 kJ electron affinity 72. mol kJ ionization energy 1011.8 mol kJ heat of fusion 0.64 mol You may find additional useful data in the ALEKS Data tab. Does the following reaction absorb or release energy? 2+ + (1) P (g) + e → P (g) Is it possible to calculate the amount of energy absorbed or released by reaction (1) using only the data above? If you answered yes to the previous question, enter the amount of energy absorbed or released by reaction (1): Does the following reaction absorb or release energy? 00 release absorb Can't be decided with the data given. yes no ☐ kJ/mol (²) P* (8) + + + e →>> P (g) Is it possible to calculate the amount of energy absorbed or released by reaction (2) using only the data above? If you answered yes to the previous question, enter the amount of energy absorbed or released by reaction (2): ☐ release absorb Can't be decided with the data given. yes no kJ/mol аarrow_forwardThe number of hydrogens in an alkyne that has a main chain of 14carbons to which are attached a cyclobutyl ring, a benzene ring, an–OH group, and a Br is A. 34; B. 35; C. 36; D. 24; E. 43arrow_forward
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