CHEM 1002 Chapter 13: Mechanisms and Rates of Reactions
15 Aug 2015
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Document Summary
Concepts of a mechanism and rate-determining step in chemical reactions. The overall reaction is the sum of the elementary steps in the mechanism. A reaction mechanism is the exact molecular pathway that starting materials follow on their way to becoming products. The rate determining step is the slowest step in the reaction mechanism. the overall reaction cannot go faster than the rate-determining step. Each reaction consists of a sequence of molecular events called a reaction mechanism. Intermediates intermediate = chemical species produced in an early step of a mechanism and consumed in a later step never appear in overall equation reactive chemical species that exist briefly. Rate-determining step speed of reaction = rate rate of overall reaction determined by rates of elementary reactions slowest mechanism = rate-determining step. Determine rate of reaction based on rate of change of concentration of a reactant or product. Calculate reaction rates from concentration vs time data.
