Lecture 23

Lecture 23 - Chem 338 Lecture 23 Reaction Mechanisms 1....

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Chem 338 C h em 3 3 8 L e c t u r e 2 3 Reaction Mechanisms 1. Elementary Reactions: One transition state a. Unimolecular b. Bimolecular c. Alternative Paths: R I 1 P R I 2 P d. Sequential Paths: R I 1 I 2 P 2. Mechanism Rate Law 3. The Steady State Approximation: d [I] /dt = 0 4. Rate Law Mechanism?? 5. Kinetics and Mechanism: Fact and Fiction?
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Chem 338 1. Elementary Reactions: One transition state a. Unimolecular rate = k [ R ] b. Bimolecular rate = k [ R 1 ][ R 2 ] c. Alternative Paths: R I 1 P R I 2 P rate = ( k 1 + k 2 )[ R ] d. Sequential Paths: R I 1 I 2 P rate = k min [ R ]
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Chem 338 2. Mechanism Rate Law Reaction: aA + bB pP R a t e l a w : 1. [ A ] α The rate limiting step is: α A + ... α total molecules of A consumed through or: ( α - n ) A + A n D ... + . .. the rate limiting step 2. [ B ] 1/2 Before the rate limiting step: The rate limiting step is: D + ... 3. [ C ] -1 Before the rate limiting step: The rate limiting step is: D + ... and there is an alternative source of C 4. { k -1 [ C ] + k 2 ... } -1
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This note was uploaded on 06/28/2010 for the course CHEM 338 taught by Professor Petersson during the Spring '10 term at Wesleyan.

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Lecture 23 - Chem 338 Lecture 23 Reaction Mechanisms 1....

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