CHM2046 Exam 1 February 2 practice2

CHM2046 Exam 1 February 2 practice2 - CHM2046 Exam 1...

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CHM2046 Exam 1 February 2, 2006 Ticking away the moments that make up a dull day You fritter and waste the hours in an off-hand way Kicking around on a piece of ground in your home town Waiting for someone or something to show you the way. -Time 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. Once the reaction A + B C + D reaches equilibrium, there is no net change to the concentrations of the species involved in the reaction because: a. none of these. b. the forward rate constant (k f ) is equal to the backward rate constant (k b ). c. reactions in both directions have stopped and nothing further can happen. d. the forward and backward reaction rates are both zero. e. not possible to decide without K c . 2. If the equilibrium constant, K, for a reaction A B is 1.0 x 10 -5 , which of the following is true at equilibrium? a. [A] >> [B] b. The reaction lies far to the right-hand side. c. The forward reaction rate is much greater than the backward reaction rate. d. All of the other four statements are wrong. e. The K for B A is 1.0 x 10 -5 . 3. Consider the reaction H 2 (g) + I 2 (g) 2 HI (g) At a particular moment in time, [I 2 ] is found to be increasing. Which of the following statements is true at that moment? a. Q c > K c b. Q c < K c c. Q c = K c d. Q c < 0 e. cannot decide without knowing K c . 4. What is K c for the following reaction? C 2 H 2 (g) + 3 H 2 (g) 2 CH 4 (g) a. b. K CH H C H c [ ] [ ] [ ] 4 2 2 3 2 2 K C H H CH c [ ][ ] [ ] 2 2 2 3 4 2
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c. d. e. 5. At a particular temperature, 2 SO 2 (g) 2 SO (g) + O 2 (g) K c = 1.8 x 10 -8 2 SO (g) 2 S (g) + O 2 (g) K c = 3.0 x 10 -10 Use the above information to calculate the K c for the reaction below at that temperature. 2 SO 2 (g) 2 S (g) + 2 O 2 (g) K c = ? a. 5.4 x 10 -18 b. 3.3 x 10 -2 c. impossible to determine d. 60 e. 1.7 x 10 -2 6. K c = 0.10 for the reaction below at a particular temperature. 2 SO 2 (g) + O 2 (g) 2 SO 3 (g) What is K c for the following reaction at the same temperature? SO
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CHM2046 Exam 1 February 2 practice2 - CHM2046 Exam 1...

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