2_KINETICS_3

2_KINETICS_3 - REACTION MECHANISMS Most reactions do not...

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Most reactions do not occur in a single step. They occur as the result of several elementary steps. The process or series of elementary steps by which a reaction occurs REACTION MECHANISM REACTION MECHANISMS MJ Bojan Chem 112 1
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This important because we know the rate law for an elementary process. An elementary step is a reaction that proceeds as written Examples: Rate Law Unimolecular Bimolecular termolecular MJ Bojan Chem 112 2
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Finding the Mechanism of a Reaction What is the Mechanism for the following reaction? NO 2 +CO NO + CO 2 Experimental Result: What would the rate law be IF it was an elementary process? MJ Bojan Chem 112 3 rate = "# NO 2 [ ] # t =
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Example: NO 2 +CO NO + CO 2 Propose a mechanism: NO 2 + NO 2 NO 3 + NO 1 NO 3 + CO NO 2 + CO 2 2 NO 2 + CO NO + CO 2 Compare with experiment Rate Law for multi-step mechanism Experimental shows: rate 1 = !" NO 2 [ ] " t = k NO 2 [ ] 2 rate 2 = !" CO [ ] " t = k NO 3 [ ] CO [ ] MJ Bojan Chem 112 4
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Rate Determining Step MJ Bojan Chem 112 5
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This note was uploaded on 01/18/2012 for the course CHEM 112 taught by Professor Vandersluys,lorschmid,kylem during the Summer '07 term at Penn State.

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2_KINETICS_3 - REACTION MECHANISMS Most reactions do not...

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