Unit 5 Self-Quiz, pages 618–619
1. (b)
2. (a)
3. (d)
4. (b)
5. (b)
6. (d)
7. (a)
8. (c)
9. (b)
10. (c)
11. (a)
12. (c)
13. (d)
14. (b)
15. (b)
16. (a)
17. True
18. False. In the last 200 years, increases in the atmospheric concentrations of greenhouse gases
can be attributed mainly to human activities.
19. False. The discovery of argon forced Dmitri Mendeleev to add another column to his
periodic table.
20. False. Ground-level ozone in photochemical smog is produced by the reaction of nitrogen
oxides and VOCs in the presence of sunlight.
21. False. Biological pollutants originate from organisms that tend to live in warm, humid places
in homes.
22. True
23. True
24. False. Pressure is defined as force per unit area.
25. False. Volume and temperature are directly proportional when the temperature is expressed
in kelvins.
26. False. In theory, the volume of a gas would shrink to zero at –273.15 ºC or 0 K.
27. False. In an inverse proportion such as Boyle's law, when one variable increases, the other
variable decreases.
28. True
PV
T
29. False. When the combined gas law is rearranged to solve for P2, the result is P2 = 1 1 ! 2 .
T1
V2
30. False. When water is decomposed by electrical energy, the volume of hydrogen gas produced
will be twice the volume of oxygen gas produced. (Assume that the gases are measured at the
same temperature and pressure.)
31. True
32. True
33. False. James Dewar was the first scientist to liquefy hydrogen.
34. False. The partial pressure of a gas collected over water is equal to the atmospheric pressure
minus the partial pressure of the water vapour mixed with the gas.
Copyright © 2011 Nelson Education Ltd.
Unit 5: Gases and Atmospheric Chemistry
U5-2
35. False. The chemical equation given below indicates that equal amounts of hydrogen and
fluorine will react to produce hydrogen fluoride. (Assume that all gases are measured at the same
temperature and pressure.)
H 2 (g) + F2 (g) ! 2 HF(g)
36. True
Copyright © 2011 Nelson Education Ltd.
Unit 5: Gases and Atmospheric Chemistry
U5-3