Unit 3 Self-Quiz, pages 404–405
1. (d)
2. (c)
3. (b)
4. (b)
5. (a)
6. (b)
7. (a)
8. (a)
9. (c)
10. (c)
11. (c)
12. (d)
13. (c)
14. (a)
15. (a) 2.6 × 10−2 mol/(L·s)
16. (c)
17. True
18. False. When a reaction is reversed in enthalpy calculations, the sign of ΔH changes
but its magnitude remains the same.
19. True
20. True
21. False. Combining 2 light nuclei to form a heavier, more stable nucleus is called
fusion.
22. False. One of the most abundant energy sources is the energy that binds the atomic
nucleus together.
23. False. A modern wind turbine can generate enough electricity to supply several
homes.
24. True
25. False. The effect of changing reactant concentrations on the rate of a reaction cannot
be predicted by looking at a balanced chemical equation.
26. False. A catalyst is a substance that increases reaction rate by providing an alternative
reaction mechanism with a lower activation energy and is not consumed in the reaction.
27. True
28. False. Biocatalysts are thought to increase reaction rate by providing an alternative
reaction mechanism with a lower activation energy.
29. True
30. False. The rate constant, k, varies depending on the chemical reaction and conditions.
31. True
32. False. The global warming potential of “super” greenhouse gases is much greater
than that of carbon dioxide.
Copyright © 2012 Nelson Education Ltd.
Unit 3: Energy Changes and Rates of Reaction U3-3