14. Consider the following numbered processes:
1. A → 2B
2. B → C + D
3. E → 2D
ΔH for the process A → 2C + E is
(A) ΔH1 + ΔH2
(B) ΔH1 + 2ΔH2 – ΔH3
(C) ΔH1 + ΔH2 + ΔH3
(D) ΔH1 + 2ΔH2 + ΔH3
(E) ΔH1 + ΔH2 – ΔH3

15. Which is wrong? (A) bomb calorimeter measures ΔH directly. (B) In an adiabatic process, q = 0 and ΔS = 0. (C) In a process of free expansion, w = 0. (D) In an isothermal process, ΔH = 0. (E) Breaking a chemical bonding is usually an endothermic reaction.

16. The following reaction is investigated (assume an ideal gas mixture). 2N2O(g) + N2H4(g) 3N2(g) + 2H2O(g) Initially there are 0.08 mol of N2O and 0.38 mol of N2H4, in a 30.0-L container. If there is 0.050 mol of N2O at equilibrium, how many moles of N2 are present at equilibrium? (A) 0.053 (B) 0.045 (C) 0.12 (D) 0.030 (E) 0.15

17. When doubling the volume of a buffer solution containing a weak acid and its conjugate base, which is correct? (A) pH will shift toward the pKa of the acid. (B) pH will significantly increase. (C) The buffer capacity will decrease. (D) Its titration curve remains the same. (E) pH will decrease when using a base and it conjugated acid as the buffer solution.

18. Calculate the concentration of chromate ion, CrO4 2–, in a saturated solution of CaCrO4 (Ksp = 7.1 × 10–4). (A) 2.7 × 10–2 M (B) 3.5 × 10–2 M (C) 7.1 × 10–4 M (D) 3.5 × 10–4 M (E) 5.0 × 10–7 M

19. How many moles of HCl(g) must be added to 1.0 L of 2.0 M NaOH to achieve a pH of 0.00? (Neglect any volume change.) (A) 3.0 mol (B) 10. mol (C) 1.0 mol (D) 2.0 mol (E) none of these

20. For a titration reaction of a weak acid, which is correct? (A) The pH of the equivalence point is dependent of the original concentrations or volumes. (B) At the equivalence point, the pH can be found by the pKa of the acid and pKb of the base. (C) The pH of the end point is depended on the pKa of the acid and pKb of the base. (D) The initial pH is not affected by the concentration. (E) The end point is always at the center of the steepest section of the titration curve no matter of the stoichiometry of reactions or the choice of indicator.

21. How many electrons are transferred in the following reaction? SO3 2–(aq) + MnO4 – (aq) → SO4 2–(aq) + Mn2+(aq) (A) 4 (B) 10 (C) 3 (D) 2 (E) 6

22. When increasing the anode solution concentration of Cu|Cu2+, which of the following would be true about the cell potential? (A) It would remain constant. (B) It would increase. (C) It would decrease. (D) This cannot be determined. (E) All are possible.

23. Calculate E at 25°C for this cell, given the following data: Ag+ + e– → Ag(s) E° = 0.80 V Ni2+ + 2e– → Ni(s) E° = –0.23 V Ksp for AgCl = 1.6 × 10–10 (A) 0.54 V (B) 2.98 V (C) 0.83 V (D) 1.01 V (E) This cannot be determined from the data given

24. The rate expression for a particular reaction is Rate = k[A][B]3 . If the initial concentration of B is increased from 0.2 M to 0.6 M, the initial rate will increase by which of the following factors? (A) 6 (B) 3 (C) 27 (D) 4 (E) 12

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