e3ps09 - Spring 2009 CH302 Practice Exam 3 Dear students...

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Spring 2009 CH302 Practice Exam 3 Dear students, For work related to organic chemistry structures and nomenclature, the following link is a useful molecule drawing tool that will tell you the preferred IUPAC name for any molecule you can think of: http://www.chemaxon.com/marvin/sketch/index.jsp And, it is kind of fun to play with. I used it to make the figures for problems 26-28. Cheers, Travis 1. Consider the reaction below: C 6 H 12 O 6 (s) + 12 O 2 (g) Æ 6 CO 2 (g) + 6 H 2 O(g) Which of the following is an incorrect expression of the rate? 1. rate = ( Δ [H 2 O] / 6· Δ t) 2. rate = -( Δ [O 2 ] / 12· Δ t) 3. rate = ( Δ [CO 2 ] / 6· Δ t) 4. rate = -( Δ [C 6 H 12 O 6 ] / Δ t) 2. The overall reaction Br 2 (g) + 2 NO 2 (g) Æ 2 BrNO(g) + O 2 (g) Has an empirically determined rate law, rate = k·[NO 2 ] 2 ·[Br 2 ]·[O 2 ] -1 . If k = 3.0 x 10 4 M -1 ·s -1 , [NO 2 ] = 0.01 M, [Br 2 ] = 0.02 M and [O 2 ] = 0.01 M, what is the observed rate? 1. 0.3 M·s -1 2. 0.0006 M·s -1 3. 300 M·s -1 4. 6.0 M·s -1 3. Consider the rate constants below: I. k = 7.45 x 10-2 M -2 ·s -1 II. k = 1.79 x 10-2 M 3 ·s -1 III. k = 4.77 x 10-2 M 1 ·s -1 Which response arranges them from lowest to highest order. 1. III, II, I 2. I, II, III 3. I, III, II 4. II, I, III 5. II, III, I 6. III, I, II 4. Consider the data below: Experiment number [A] M [B] M [C] M [D] M initial rate M·s -1 1 0.42 0.5 1.12 2.01 1.06 x 10 -6 2 0.84 0.5 1.12 2.01 2.12 x 10 -6 3 0.75 0.25 1.12 2.01 1.89 x 10 -6 4 1.23 0.93 0.97 2.01 3.58 x 10 -6 5 0.21 1.35 0.56 5.53 8.02 x 10 -6 What is the overall order of this reaction? 1. 1 2. 2 3. 3 4. 4
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5. Consider the elementary reaction: CH 4 (g) + 2 O 2 (g) Æ CO 2 (g) + 2 H 2 O(g) If k = 9.7 x 10 6 M -1 ·hr -1 , and there is initially 0.014 M H 2 O, how long will it take for the H 2 O concentration to reach 7.95 M? 1. 36 ms
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e3ps09 - Spring 2009 CH302 Practice Exam 3 Dear students...

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