Answers to 2nd Semester Review Questions 2005:

1.  c    2. c    3. c    4. d    5. b    6. c   7 a    8. a    9. d    10. c    17. a    18. d    19. b    23. e    24. c    25. c    26. d    27. b    28. a    29. d    30. c    31. c    32. c    33. c    34. b    35. d   36. b    37. b    38. d    39. b    40. a    41. b    42. a    43. d    44.b    48. b    49. a

Part II    1 (a)  3K₂S  +  2Cr(NO₃)₃  -->  6KNO₃  +  Cr₂S₃

                (b)  3S^2-  +  2Cr³⁺  -->  Cr₂S₃

2. 4.19 g        3.(a) 1.05 moles    (b) 3.16 x 10²⁴ molec.    (c) 70.6 L    (d) 1.13 atm, 114 kPa, 859 mmHg

4.  As the contained gas is heated the molecules begin to move faster.  As they move faster they collide more often and with more energy against the rigid walls.  The increased frequency and energy of the collisions corresponds to and increase in pressure of the gas.

5. (a) H₂PO₄^- acid: HPO₄^2- conjugate base        (b) NH₃ base: NH₄⁺ conjugate acid

6.  POH = 6.55, [OH^-] = 2.8 x 10^-7 M, [H₃O⁺] = 3.55 x 10^-8 M

7. (a) K_a = [CH₃COO^-][H₃O⁺] / [CH₃COOH]        (b)  K_a = 1.8 x 10^-5        (c) Ka would not change since Ka only varies with temperature and not with different initial concentrations of components.

8. (a) exothermic    (b) reactants