ex1SP07 - CHEMISTRY 13 EXAM Feb. 6, 2007 FORM A

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Unformatted text preview: CHEMISTRY 13 EXAM Feb. 6, 2007 FORM A ---------------------------------------------------------------------------------------------------------- 1. In the following reaction, how is the rate of Br 2 formation related to the rate of HBr consumption? 4 HBr(g) + O 2 (g) ! 2 Br 2 (g) + 2 H 2 O(g) A. t HBr t Br ! ! " = ! ! ] [ 2 1 ] [ 2 B. t HBr t Br ! ! " = ! ! ] [ 2 ] [ 2 C. t HBr t Br ! ! " = ! ! ] [ ] [ 2 D. t HBr t Br ! ! " = ! ! ] [ 4 1 ] [ 2 E. t HBr t Br ! ! " = ! ! ] [ 4 ] [ 2--------------------------------------------------------------------------------------------------------- 2. For the first order reaction of A to produce B, the rate constant is 2.5 " 10 ! 3 s ! 1 . How long does it take for [A] to decrease to 1/3 of its initial value? A. 7.5 " 10 ! 3 s B. 13 s C. 280 s D. 400 s E. 440 s -------------------------------------------------------------------------------------------------------- 3. For the elementary reaction: 2 A ! C the initial concentration of A was 1 M, and decreased to 50% of its initial value in 1000 s. What is k for this reaction? A. 5 " 10 ! 4 M ! 1 s ! 1 B. 1 " 10 ! 3 M ! 1 s ! 1 C. 5 " 10 ! 3 M ! 2 s ! 1 D. 1 " 10 ! 2 M ! 2 s ! 1 E. 7 " 10 ! 2 M ! 1 s ! 1---------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- 4. For the reaction: A + B + C ! D the initial rates as a function of reactant concentration were determined to be: [A] (M) [B] (M) [C] (M) Initial Rate (M/s) 0.1 0.1 0.1 5 " 10 ! 5 0.2 0.1 0.1 2 " 10 ! 4 0.2 0.2 0.1 4 " 10 ! 4 0.1 0.2 0.1 1 " 10 ! 4 0.1 0.1 0.2 5 " 10 ! 5 0.2 0.2 0.3 4 " 10 ! 4 What is the rate law for this process? A. Rate = k [A][B] 2 B. Rate = k [A] 2 [B] C. Rate = k [A][B][C] D. Rate = k [B][C] 2 E. Rate = k [A][C] 2------------------------------------------------------------------------------------------------- 5. Why do the rates of reactions increase when the concentrations of reactants are increased? A. There is an increase in the magnitude of the rate constant. B. The average kinetic energy of the reactants increases. C. It ensures that all of the reactants will collide with the proper orientation for reaction. D. It lowers the energy of the transition state. E. It increases the frequency of collisions. ----------------------------------------------------------------------------------------------- 6. One way enzyme catalysts increase the rate of reactions is by: A. decreasing the energy of the products B. shifting the equilibrium to favor product formation C. increasing the temperature during the reaction D. decreasing the activation energy of the reaction E. increasing the activation energy of the reaction ----------------------------------------------------------------------------------------------- ------------------------------------------------------------------------------------------------- 7. 7....
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ex1SP07 - CHEMISTRY 13 EXAM Feb. 6, 2007 FORM A

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