2007 Exam 02 - CHE132Spring2007Exam02 Multiple Choice...

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CHE132Spring2007Exam02 Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. There are 21 questions that count five points each, so you can miss one and still score 100%. ____ 1. If the equilibrium constants for Reaction 1 and Reaction 2 are denoted K 1 and K 2 respectively, then the equilibrium constant for Reaction 3 is _____. Reaction 1: 2 HCl(g) H 2 (g) + Cl 2 (g) Reaction 2: I 2 (g) + Cl 2 (g) 2 ICl(g) Reaction 3: 2 HCl(g) + I 2 (g) 2 ICl(g) + H 2 (g) A) K 1 /K 2 . B) (K 1 +K 2 )/2. C) K 1 K 2 . D) K 1 +K 2 . E) K 1 K 2 /2. ____ 2. Consider the reaction H 2 (g) + Br 2 (g) 2 HBr(g). If the partial pressures in an equilibrium mixture of H 2 , Br 2 , and HBr are 0.024 atm, 0.031 atm, and 5.07 atm, respectively, the value of K p for this reaction is _____. A) 3.5 10 4 . B) 1.4 10 4 . C) 6.8 10 3 . D) 3.7 10 2 . E) 1.9 10 2 . ____ 3. For the following reaction in aqueous solution, K c = 0.95. ethanol + acetic acid ethyl acetate + water CH 3 CH 2 OH(aq) + CH 3 COOH(aq) CH 3 COOCH 2 CH 3 (aq) + H 2 O(l) Which statement is correct about an aqueous solution containing 0.45 M ethanol, 0.45 M acetic acid and 1.1 M ethyl acetate? A) Q < K, so the system will react to the right and increase the product concentration. B) Q < K, so the system will react to the left and reduce the product concentration. C) The solution is at equilibrium. D) Q > K, so the system will react to the right and increase the product concentration. E) Q > K, so the system will react to the left and reduce the product concentration. ____ 4. Which statement about equilibrium in a chemical reaction and equilibrium constants is not correct? A) Lowering the temperature of an endothermic reaction causes the concentrations of the reactants to increase. B) The enthalpy effect on the equilibrium constant says that the reaction favors the species (products or reactants) that has the lower energy. C) Adding a catalyst has no effect on the equilibrium concentrations.
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D) When equilibrium has been reached, chemical reactions stop. E) The entropy effect on the equilibrium constant says that the reaction favors the species (products or reactants) that disperses the energy over the largest number of states. ____ 5. In view of the relationship
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This note was uploaded on 04/23/2010 for the course CHE 132 taught by Professor Hanson during the Spring '08 term at SUNY Stony Brook.

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2007 Exam 02 - CHE132Spring2007Exam02 Multiple Choice...

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