Chemistry 112 Day 10.docx - Chemistry 112 – Day 10 Kinetics Reaction Mechanisms o Reaction mechanisms are the chemical steps which lead to an overall

Chemistry 112 Day 10.docx - Chemistry 112 – Day 10...

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Chemistry 112 – Day 10 (09/30/2019) Kinetics Reaction Mechanisms o Reaction mechanisms are the chemical steps which lead to an overall reaction. o Each step is called an elementary step. Sum of elemental steps = overall reaction Molecularity is used to describe the elementary steps. Unimolecular, bimolecular, termolecular o Compounds that appear in the elementary steps but not in the overall reaction are intermediates o Rate laws for elementary steps can be derived without the need for experimental data o A reaction mechanism is first proposed and then tested experimentally The Rate-Determining Step o The elementary step that is much slower than the rest of the steps is the rate- determining step. o This step is related to the overall rate law that you experimentally determine. Proposed Mechanisms o Two conditions must be satisfied for a proposed mechanism to be valid. The sum of the elementary steps must be the overall reaction.
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  • Spring '08
  • LEMASTER
  • Chemistry, Kc, Keq,  Sum of elemental steps

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