Quiz 6, Spring 2011 - Version 277 Quiz 6 laude (51635) This...

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Version 277 – Quiz 6 – laude – (51635) 1 This print-out should have 8 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 5.0 points Consider the reaction mechanism below: Step Reaction 1 CH 3 Br -→ CH 3 + + Br - 2 CH 3 + + HCl -→ CH 3 Cl + H + 3 H + + Br - -→ HBr overall CH 3 Br + HCl -→ CH 3 Cl + HBr IF the rate law is experimentally determined to be rate = k · [CH 3 Br] · [HCl] · [Br - ] - 1 , what is the rate-limiting step? 1. step 2 correct 2. not enough inFormation 3. step 3 4. step 1 Explanation: The reactants that precede the slowest For- ward step will appear in the rate law For a reaction. 002 5.0 points Consider the rate constants below. Which would correspond to the highest order reac- tion? 1. k = 4 . 46 × 10 - 1 M - 1 · s - 1 2. k = 2 . 35 × 10 6 s - 1 3. k = 8 . 79 × 10 2 M · s - 1 4. k = 1 . 88 × 10 - 3 M - 2 · s - 1 correct Explanation: Units oF M - 2 · s - 1 would correspond to a 3 rd order reaction.
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This note was uploaded on 09/17/2011 for the course CH 302 taught by Professor Holcombe during the Spring '07 term at University of Texas at Austin.

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Quiz 6, Spring 2011 - Version 277 Quiz 6 laude (51635) This...

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