e1_132_f10 - Exam 1, CHE 132 Fall 2010 Multiple Choice, 5...

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Exam 1, CHE 132 Fall 2010 Multiple Choice, 5 points each On the Scantron form, bubble in the letter of the one choice that best completes the statement or answers the question. No credit will be given for multiple answers. ____ 1. In the reaction 2 A + B C + 3 D it is found that at time t = 10 s reactant A disappears at a rate of 6.2 × 10 –4 mol L –1 s –1 . What is the rate of formation of D, expressed in units of mol L –1 s –1 ? A. rate = 6.2 × 10 –4 B. rate = 9.3 × 10 –4 C. rate = 3.1 × 10 –4 D. rate = 1.24 × 10 –3 E. rate = 1.86 × 10 –3 ____ 2. Consider the following two-step mechanism for a reaction: NO 2 (g) + Cl 2 (g) ClNO 2 (g) + Cl(g) (slow) NO 2 (g) + Cl(g) ClNO 2 (g) (fast) Which of the following statements is incorrect ? A. The overall reaction is 2 NO 2 (g) + Cl 2 (g) 2 ClNO 2 (g) B. The species Cl(g) is an intermediate in the reaction. C. The rate limiting step is the elementary step with rate constant k 2 . D. The instantaneous rate is defined as rate = – d [Cl 2 ]/ dt . E. The rate law for the reaction is rate = k [NO 2 ] [Cl 2 ]
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____ 3. A proposed mechanism for the decomposition of hydrogen peroxide (H 2 O 2 ) consists of three elementary steps: H 2 O 2 (g) 2 OH(g) H 2 O 2 (g) + OH(g) H 2 O(g) + HO 2 (g) HO 2 (g) + OH(g) H 2 O(g) + O 2 (g) If the rate of the reaction is first order with respect to H 2 O 2 (g), which step in the mechanism is the rate limiting step? A. The first step. B. The second step. C. The third step. D. Steps 1 and 2 are both rate limiting steps E. The mechanism is not consistent with a rate law that is of first order with respect to H 2 O 2 (g). ____ 4. What are the units of the rate constant for a reaction whose rate law is of second order with respect to reactant A and of zero order with respect to reactant B? A. L mol 1 s 1 B. L mol 1 s C. L 2 mol 2 s 1 D. L 2 mol 1 s 2 E. L 1/2 mol 1/2 s 1 ____ 5. A certain chemical reaction has an energy change ΔE° = –20.0 kJ mol –1 .
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This note was uploaded on 03/06/2012 for the course CHE 132 taught by Professor Hanson during the Fall '08 term at SUNY Stony Brook.

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e1_132_f10 - Exam 1, CHE 132 Fall 2010 Multiple Choice, 5...

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