
Concept explainers
(a)
Interpretation: The combustion of gasoline in a car engine is exothermic or endothermic needs to be explained.
Concept Introduction: In an exothermic reaction energy discharges from the system while in endothermic reaction consumed energy from the surrounding. Chemical energy is the type of potential energy that stores energy in
(a)

Answer to Problem 61A
Combustion of gasoline is exothermic process.
Explanation of Solution
Combustion is an exothermic reaction as it discharges heat. A large amount of heat is discharge during the combustion of gasoline in a car engine. In exothermic reaction, energy releases as heat and flows out of the system into the surroundings.
(b)
Interpretation: Water vapor condensing on a cold pipe exothermic or endothermic needs to be explained.
Concept Introduction: In an exothermic reaction energy discharges from the system while in endothermic reaction consumed energy from the surrounding. Chemical energy is the type of potential energy that stores energy in chemical bonds. Chemical energy is consumed when those bonds are created, and chemical energy is discharge when they split.
(b)

Answer to Problem 61A
Water vapor condensing on a cold pipe is exothermic.
Explanation of Solution
Water vapor condensing on a cold pipe an exothermic reaction as it discharges heat during the process. Water vapor discharge energy into the pipe and cools to the point that the vapor molecules transform into a liquid state.
(c)
Interpretation:
Concept Introduction: In an exothermic reaction energy discharges from the system while in endothermic reaction consumed energy from the surrounding. Chemical energy is the type of potential energy that stores energy in chemical bonds. Chemical energy is consumed when those bonds are created, and chemical energy is discharge when they split.
(c)

Answer to Problem 61A
Explanation of Solution
Conversion of solid
(d)
Interpretation:
Concept Introduction: In an exothermic reaction energy discharges from the system while in endothermic reaction consumed energy from the surrounding. Chemical energy is the type of potential energy that stores energy in chemical bonds. Chemical energy is consumed when those bonds are created, and chemical energy is discharge when they split.
(d)

Answer to Problem 61A
Explanation of Solution
Conversion of
Chapter 10 Solutions
World of Chemistry, 3rd edition
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