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2009 Exam 02 - CHE132S09Ex02 Multiple Choice Identify the...

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CHE132S09Ex02 Multiple Choice Identify the choice that best completes the statement or answers the question. There are 26 questions, each question counts 4 points, so one is a bonus question, and you can miss one and still score 100%. ____ 1. What is the correct expression for the rate of the smog-producing reaction below? 2NO(g) + O 2 (g) 2NO 2 (g) A) rate = [NO] 2 / t B) rate = – [NO] 2 / t C) rate = –  [NO] 2 [O 2 ])/ t D) rate = – [NO]/ t E) rate = [O 2 ]/ t Trial Initial [Br 2 ] (M) Initial [NO] (M) Initial Rate (M/s) 1 0.025 0.040 1.2 2 0.025 0.080 2.4 3 0.025 0.120 3.6 4 0.050 0.040 4.8 5 0.075 0.040 10.8 ____ 2. The rate data given in the table above were collected for the following reaction. What is the experimental rate law for this reaction? 2 NO(g) + Br 2 (g) 2NOBr(g) ____ 3. Which one of the following statements A-D correctly describes a reaction for which a plot of ln[reactant] vs time produces a straight line? If all are correct respond (E). ____ 4. The rate constant for the decay of a toxic chemical in ground water is 0.10/month. If the concentration of this chemical is 0.15 M, how long will it take for the concentration to fall to 0.0015 M?
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