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New%20Mech%20Slides%202010

New%20Mech%20Slides%202010 - Mechanisms Reactions rarely if...

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Mechanisms Reactions rarely, if ever, proceed as outlined in a chemical equation: Typically, more complex types of things are occurring: A proposed pathway by which a reaction might occur is know as a mechanism . Chemical Kinetics 2 A + B ⎯ → ← ⎯ C + 3 D A + B ⎯ → ← ⎯ AB * AB * + A ⎯ → ← ⎯ E * E * ⎯ → ← ⎯ C + 3 D
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Mechanisms A mechanism: a) Is a proposed pathway made up of a series of elementary steps that, when put together, define a possible pathway by which a reaction occurs; b) Must explain the rate law, side products, stereochemistry, etc.; in short, all parameters of the observed reaction; c) Can be one step OR many; d) In a multiple step mechanism, one step will be slower than the rest and control the maximum rate of the reaction ; e) Can never be proven, only disproven! Chemical Kinetics
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Elementary Reaction An elementary reaction (or step ) is a proposed reaction between individual molecules participating in a given kinetic process (hence the name). Phase of species is rarely indicated. Individual steps are typically written as an
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