Practice Exam 2 2009(1)

Practice Exam 2 2009(1) - CHM2046 Exam 2 March 9, 2006...

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CHM2046 Exam 2 March 9, 2006 Please bubble in A , B or C as the test form code at the top right of your answer sheet. VERSION 0 For this version the correct answer to each question is a. 1. Predict the sign of Δ rxn for the following reaction: 2 C (s) + O 2 (g) 2 CO (g) a. positive b. depends on Δ S univ c. negative d. cannot be predicted e. zero 2. What is the solubility of the salt M 2 X 3 (containing M 3+ and X 2- ions) if its K sp = 2.6 x 10 -4 ? a. 7.5 x 10 -2 M b. 1.3 x 10 -1 M c. 1.9 x 10 -1 M d. 2.6 x 10 -4 M e. none of these 3. Addition of which of the following very soluble salts is most likely to increase the solubility of MgCO 3 in water? a. NH 4 Cl b. KCl c. Na 2 CO 3 d. MgI 2 e. NaNO 3 4. Which of the following substances will have the greatest molar entropy? a. C 3 H 8 (g) b. CH 4 (g) c. C 6 H 6 (l) d. C 2 H 6 (g) e. C 4 H 10 (l) 5. Which of the following is always true for a spontaneous reaction? a. none of these b. Δ S surr > 0 c. Δ S rxn > 0 d. Δ S rxn < 0 e. Δ S univ > Δ S rxn + Δ S surr 6. A solution is prepared that contains [Pb 2+ (aq)] = 1.4 x 10 -2 M, and [I - (aq)] = 2.0 x 10 -4 M. Will a precipitate of PbI 2 (s) form? (K sp for PbI 2 is 7.9 x 10 -9 ). a. no b. none of these c. only if Na + (aq) ions are also added d. yes e. cannot be determined 7. The solubility product expression (K sp ) for BaF 2 (s) in water is: a. K sp = [Ba 2+ (aq)][F - (aq)] 2 b. none of these c. K sp = [Ba 2+ (aq)][F - (aq)] d. K sp = [Ba 2+ (aq)][F - (aq)] 2 /[BaF 2 (s)] e. K sp = [Ba 2+ (aq)][F - (aq)]/[BaF 2 (s)]
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8. Calculate the pH when 100 mL of 0.100 M Ca(OH) 2 solution is added to 200 mL of 0.200 M HCl solution. a.
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Practice Exam 2 2009(1) - CHM2046 Exam 2 March 9, 2006...

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