SampleEx1 - Chem 6 sample exam 1 (100 points total) @ This...

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Chem 6 sample exam 1 (100 points total) @ This is a closed book exam to which the Honor Principle applies. @ The last page contains several equations which may be useful; you can detach it for easy reference. @ Please write clearly and SHOW YOUR WORK. If you need to write on the back of the exam paper, please indicate this clearly. @ Some questions are more challenging than others. Allot your time accordingly, and try to answer EVERY question. NAME _____________________________________________________
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2 1. (8 pts) OCl + I ---> OI + Cl Some initial concentration and rate data for this reaction, in basic aqueous solution, is shown. [OCl ] (M) [I ] (M) [OH ] (M) Rate (Ms –1 ) 0.0040 0.0020 1.00 4.8x10 –4 0.0020 0.0040 1.00 4.8x10 –4 0.0020 0.0020 1.00 2.4x10 –4 0.0020 0.0020 0.50 4.8x10 –4 0.0020 0.0020 0.25 9.6x10 –4 (a) (3 pts) Find the order of reaction with respect to OCl , I , and OH . Briefly show how you got these results. (b) (2 pts) Give the overall reaction order. (c) (3 pts) Write the rate law and find the value of k (Don't forget the units.)
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3 2. (12 pts) At 690 K and constant volume, the total pressure in the reaction C 2 H 4 O (g) -----> CH 4 (g) + CO (g) is measured as a function of time. [At the "infinite" time, you can assume all the C 2 H 4 O has reacted.] time (min) 10 20 40 60 100 200 "infinity" P(torr) 139.14 151.67 172.65 189.15 212.34 238.66 249.88 Find the rate law for the reaction and the value of the rate constant.
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4 3. (16 pts) For the reaction H 2 + Br 2 ---> 2HBr the following chain mechanism has been proposed: Br 2 2Br k 1 Br + H 2 HBr + H k 2 H + Br 2 HBr + Br k 3 H + HBr H 2 + Br k 4 Br + Br Br 2 k 5 (a) (3 pts) Label the steps as initiation ( I ), propagation ( P ) or termination ( T ) in the spaces provided above (you don't need to label the 4th step.)
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This note was uploaded on 05/01/2008 for the course CHEM 5/6 taught by Professor Gribble during the Spring '08 term at Dartmouth.

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SampleEx1 - Chem 6 sample exam 1 (100 points total) @ This...

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