Mock Exam 2 Spring 2009 ver. 5

Mock Exam 2 Spring 2009 ver. 5 - CH102 Spring 2009 Mock...

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CH102 Spring 2009 Mock Exam 2 Page 1 of 6 CH102 Spring 2009—Mock Exam 2 1. What is the average rate of concentration change for ammonia, NH 3 , if the average rate of concentration change Δ [H 2 ]/ Δ t, is 1.5 x 10 -3 M/s for the reaction below? N 2 (g) + 3 H 2 (g) 2 NH 3 (g) A. 5.0 x 10 4 M/s C. 1.0 x 10 3 M/s B. 2.2 x 10 3 M/s D. 3.0 x 10 3 M/s 2. What is the half life of the following first order reaction? A. 60 min D. 10 min B. 30 min E. 5 min C. 15 min 3. H for an uncatalyzed reaction is 5.0 kJ/mol. If the activation energy, Ea, is 20.0 kJ/mol, which reaction is faster? A. the forward reaction B. the reverse reaction C. both reactions occur at the same rate D. The reaction will not take place without a catalyst 4. For the overall reaction ClO (aq) + I (aq) Cl (aq) + IO (aq) the accepted mechanism is: 1) ClO (aq) + H 2 O (l) HClO (aq) + OH (aq) [fast] 2) I (aq) + HClO (aq) HIO (aq) + Cl (aq) [slow] 3) OH (aq) + HIO (aq) H 2 O (l) + IO (aq) [fast] Which of the following is a reaction intermediate? A. I C. IO B. HClO D. H 2 O 5. Consider the reaction and its rate law: 3A + B 2C rate = k[A] 3 . Which will not increase the rate of reaction? A. Increasing the concentration of A B. Adding a suitable catalyst C. Increasing the temperature D. Increasing the concentration of B E. All will increase the rate. 6. The relative rates of experiments I, II, III & IV are 2:2:1:6, respectively. What is the rate law for the following reaction of W (white spheres) and B (black spheres)? W (g) + B (g) products A. rate = k[W][B] B. rate = k[W][B] 2 C. rate = k[W] 2 [B] D. rate = k[W] 2 [B] 2 E. rate = k[W] 7. What is the rate law for the reaction: 2 NO (g) + Cl 2 (g) 2 NOCl (g) given the following initial rate data. Exp. [NO] [Cl 2 ] Initial rate (M/hr) 1 0.0124 M 0.088 M 1.91 x 10 -3 2 0.0124 M 0.352 M 7.66 x 10 -3 3 0.0248 M 0.352 M 3.06 x 10 -2 A. rate = k[NO][Cl 2 ] C. rate = k[NO][Cl 2 ] 2 B. rate = k[NO] 2 [Cl 2 ] D. rate = k[Cl 2 ] I II III IV t = 0 min t = 30 min

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CH102 Spring 2009 Mock Exam 2 Page 2 of 6 8. Consider the reaction: 2A (g) + B (g) 2C (g) When the concentration of substance B in the reaction is doubled (all other factors held constant), it is found that the rate of the reaction remains unchanged. The most probable explanation for this observation is that: A. The reactant with the smallest coefficient in the balanced equation usually has little or no effect on the rate of reaction.
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Mock Exam 2 Spring 2009 ver. 5 - CH102 Spring 2009 Mock...

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