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SCAN0017 - Reaction Mechanisms Reaction mechanisms pull...

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Unformatted text preview: Reaction Mechanisms Reaction mechanisms pull apart a reaction into elementary steps that do dictate the rate equation since the rate equation for any elementary step is defined by the Stoichiometry of the step. The order and the molecularity are the same. If an elementary step is first order, it is also unimolecular. If an elementary step is second order, it is also bimolecular. A reaction mechanism involves more than one elementary step. The products of a reaction can not be produced at a rate faster than the rate of the slowest elementary step. This is called the rate determining step or rate-limiting step and typically defines the order of the overall reaction. If an elementary step is slow, it is assumed that the activation energy is large for that step whereas if an elementary step is fast, the activation energy is small for that step, Typically the product of an elementary step (not the last one) is called an intermediate which may not have a long lifetime but is sometimes detectablefiw‘ “(pawl fiqfik 5 ...
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