4_LectureWeb - Learning Objectives You should 1 know that a...

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Learning Objectives 1/17/08 You should: 1. know that a reaction mechanism is a sequence of elementary steps that describes the details of the conversion of reactants to products in an overall chemical reaction. 2. understand that reaction mechanisms are inferred from observed kinetics. 3. be able to identify the molecularity and to write rate (law) equations for elementary steps. 4. be able to predict the rate associated with a mechanism under rate-determining/rate- limiting and steady-state/rapid equilibrium conditions. 5. be able to determine if a rate law equation is consistent with a proposed mechanism. 6. understand that although rate laws for elementary reaction steps can be determined from the stoichiometry, rate laws for overall reactions cannot be deduced from the balanced chemical equation but instead must be determined experimentally . Reaction Mechanisms What is a reaction mechanism? Ë sequence of steps (elementary reactions) that transform reactants to products. The reac - tion mechanism offers molecular-level insight by providing a detailed sequence for bond breaking and formation. Key Requirements: Ë The mechanism must be consistent with the experimentally determined rate law. Ë The sequence of steps must yield the overall reaction stoichiometry; in other words, the sum of elementary steps gives the overall reaction stoichiometry. Why is it important to have knowledge of reaction mechanisms? Ë helpful in predicting new reactions and discovering new applications of the associated chemistry Ë useful in identifying ways to manipulate reactions 2 Reaction Mechanisms: An Example Elementary Step 1 : N 2 O H g L ö N 2 H g L + O H g L Elementary Step 2 : N 2 O H g L + O H g L ö N 2 H g L + O 2 H g L A Combining Steps 1 & 2 : N 2 O H g
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This note was uploaded on 03/19/2008 for the course CEM 142 taught by Professor A.pollock during the Spring '08 term at Michigan State University.

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4_LectureWeb - Learning Objectives You should 1 know that a...

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