EXAM_2_Fall2009 - CHEM. 31 EXAM 2 06. NOVEMBER 2009 NAME:_...

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1 CHEM. 31 EXAM 2 06. NOVEMBER 2009 NAME:______________________ This exam must be completed without the aid of books, notes or colleagues. You may use a non- programmable calculator; if your calculator is programmable, you must present it to a TA and have it cleared before you begin the exam. All answers must be clearly written in the space indicated and mathematical work must be shown for full credit to be awarded for numerical answers and for all answers for which calculations are carried out . Please write your name on the top of each page. A periodic chart and several equations are included as the last page of the exam. GRADING: (Page): Total points possible Total points awarded (2): 4 (3): 8 (4): 9 (5): 4 (6): 8 (7): 8 (8): 9 (9): 12 (10): 20 (11): 18 TOTAL: 100 Remember: “Hope is like a road in the country; there was never a road, but when many people walk on it, the road comes into existence.” Lin Yutang (1895-1976)
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2 NAME:____________________________ PART I : ( 50 points) Circle the letter of the correct answer or write the answer in the space provided. If numerical work is required, show it in the space provided. Points are shown for each problem. [ 1] (2 points) Which of the following reaction pathways shows the effect of a catalyst (black) on an uncatalyzed reaction (gray)? a. c. b. d. [ 2 ] (2 points) The mechanism for the first-order reaction 2 H 2 O 2 ( aq ) 2 H 2 O( ) + O 2 in the presence of I ( aq ) is proposed to be Step 1: H 2 O 2 ( aq ) + I ( aq ) H 2 O( ) + OI ( aq ) (slow) Step 2: H 2 O 2 ( aq ) + OI ( aq ) H 2 O( ) + O 2 ( g ) + I ( aq ) (fast) Identify the catalyst in the reaction. a. H 2 O 2 b. OI - c. I - d. H 2 O Identify the intermediate in the reaction: a. H 2 O 2 b. OI - c. I - d. H 2 O
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3 NAME:________________________________ [3] (6 points) A proposed mechanism for the photodecomposition of ozone in the stratosphere is Step 1: O 2 ( g ) + h O( g ) + O( g ) Step 2: O( g ) + O 2 (g) + M( g ) O 3 ( g ) + M*( g ) Step 3: O 3 ( g ) + h O 2 ( g ) + O( g ) Step 4: O( g ) + O( g ) + M( g ) O 2 ( g ) + M*( g ) where M is some other gas molecule (or atom) and M* indicates that M has been excited by a collision. (i) What is the molecularity of Step 1?
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This note was uploaded on 10/03/2011 for the course CHEM 31 taught by Professor Roberts during the Fall '10 term at Lehigh University .

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EXAM_2_Fall2009 - CHEM. 31 EXAM 2 06. NOVEMBER 2009 NAME:_...

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