Chapter 5 Self-Quiz, page 337
1. (c)
2. (b)
3. (a)
4. (b)
5. (d)
6. (d)
7. (d)
8. (a)
9. True
10. False. The ΔH of an exothermic reaction is a negative value.
11. False. Scientists use potential energy diagrams to describe the energy transferred
during a chemical or physical change.
12. False The state of reactants and products must be considered when calculating the
enthalpy of a reaction.
13. True
14. True
15. True
16. True
17. False. If you write a formation equation for each of the substances in a chemical
reaction, these reactions can be used in a Hess's Law calculation to determine the
enthalpy of the reaction.
18. True
19. False. The enthalpy of formation of O2(g) is zero.
20. True
21. False. A modern wind turbine can generate enough electricity to meet the needs of
several homes.
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Chapter 5: Thermochemistry
5-1