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Rev Prob. Exam 1 09-106 S 11 - Review Problems for EXAM...

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Review Problems for EXAM 1 (with selected answers) 09-106 Spring 2011 1 I. For the following statements, circle T if the statement is TRUE and F if it is FALSE . T F 1. During a hike up a mountain, both the altitude reached and the heat absorbed by the water you are drinking are state functions. T F 2. The sign of Δ Gº as a criterion for spontaneity has no restrictions. T F 3. An exothermic reaction that shows an increase in entropy will be spontaneous at all temperatures. T F 4. The only way in which a system can do work on the surroundings is by expansion against an external pressure. T F 5. For a gas expansion between a given set of initial and final states, Δ S tot for the reversible process is equal to Δ S tot for the irreversible process between the same initial and final states. T F 6. At a given temperature and pressure, propane, CH 3 CH 2 CH 3 , has a greater standard molar entropy than cyclopropane (in which the three C atoms form a triangular shape). T F 7. All spontaneous processes occur fast. T F 8. The Δ H o f for CO 2 (g) = Δ H o rxn for the combustion of graphite carbon. T F 9. For a reaction in a sealed, rigid container, Δ H is always greater than Δ E. T F 10. I 2 (s) has a higher entropy than Br 2 (l). T F 11. For a reaction with a negative Δ G°, the reverse reaction is spontaneous. II . Circle the letter of the best answer for the following multiple choice questions. 1. For the reaction CH 4 (g) + 2O 2 (g) barb2right CO 2 (g) + 2H 2 O(l), Δ H is equal to: (a) Δ E – 2RT (b) Δ E – RT (c) Δ E (d) Δ E + RT (e) Δ E + 2RT 2. For a chemical reaction to be spontaneous only at temperatures < ( Δ H°/ Δ S°), which of the following conditions must be met? (a) Δ S°>0, Δ H°>0 (b) Δ S°>0, Δ H°<0 (c) Δ S°<0, Δ H°<0 (d) Δ S°<0, Δ H°>0 3. Which of the following reactions represents a formation reaction? (a) C(g) + 2H 2 (g) + ½ O 2 (g) barb2right CH 3 OH(l) (b) C(g) + 4H(g) + O(g) barb2right CH 3 OH(l) (c) C(graphite) + 4H(g) + O(g) barb2right CH 3 OH(l) (d) C(diamond) + 4H(g) + O(g) barb2right CH 3 OH(l) (e) C(graphite) + 2H 2 (g) + ½ O 2 (g) barb2right CH 3 OH(l)
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Review Problems for EXAM 1 (with selected answers) 09-106 Spring 2011 2 4. For which of the following reactions is Δ H Δ E? (a) H 2 (g) + I 2 (s) barb2right 2 HI(g) (b) N 2 (g) + O(g) barb2right N 2 O(g) (c) C(graphite) barb2right C(diamond) (d) Both a and c (e) CH 4 (g) + 2 O 2 (g) barb2right CO 2 (g) + 2 H 2 O(l) 5. The molar entropy of an element at 298 K is equal to the area under the curve obtained by plotting (from T = 0 to T = 298 K) (a) C P vs. T (b) ln C P vs. T (c) ln(C
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