RxnMechanisms - Chemical Reaction Mechanisms Reaction...

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Reaction Mechanisms and Catalysts Chemical Reaction Mechanisms Chemical Reaction Mechanisms The reactants in a reaction can be converted to products through a series of elementary steps A single step in a reaction mechanism that involves only one molecular event In this case, the orders in the rate law are the stoichiometric coefficients A ! products Unimolecular Rate = k [A] 2A ! products Bimolecular Rate = k [A] 2 A+B ! products Bimolecular Rate = k [A][B] 2A+B ! products Termolecular Rate = k [A] 2 [B] NO 2 (g) + CO(g) ! NO(g) + CO 2 (g) Observed Rate Law: Rate = k[NO 2 ] 2 Rate 1 = k 1 [NO 2 ] 2 NO 2 (g) + NO 2 (g) ! NO 3 (g) + NO(g) NO 3 (g) + CO(g) ! NO 2 (g) + CO 2 (g) Rate 2 = k 2 [NO 3 ][CO] CO(g) + NO 2 (g) ! CO 2 (g) + NO(g) Chemical Reaction Mechanisms: Example 1 In this reaction, Rate 1 is much less than Rate 2 The reaction can proceed no faster than the slowest step! The slowest step is called the: Rate Limiting Step When a reaction mechanism contains a rate limiting step, if the slowest step is the FIRST STEP , then the rate law for the reaction will be the rate law for the limiting step.
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The intermediate steps in a reaction mechanism must: 1) Yield the overall balanced equation for the net reaction when combined 2) Agree with the rate law that is determined empirically for the overall reaction and How do you know if a reaction mechanism is correct? You don’t….
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This note was uploaded on 01/09/2011 for the course SCIENCE 12084 taught by Professor Mrdavidbyrum during the Spring '10 term at Harrison College.

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RxnMechanisms - Chemical Reaction Mechanisms Reaction...

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