Elementary Reactions and Reaction Mechanisms


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Kimberly 1H
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Elementary Reactions and Reaction Mechanisms

Postby Kimberly 1H » Mon Mar 04, 2019 11:58 pm

Can someone please explain how elementary reactions relate to reaction mechanisms? And how do the two terms explain the decomposition of O3 to O2?

Camille Marangi 2E
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Joined: Fri Sep 28, 2018 12:26 am

Re: Elementary Reactions and Reaction Mechanisms

Postby Camille Marangi 2E » Tue Mar 05, 2019 11:09 am

Elementary reactions are the step by step sequences that make up overall reaction mechanisms. For example 3 elementary steps can add up to one overall reaction mechanism with intermediates, catalysts, etc.. The slow step of a mechanism determines the rate law and the overall reaction formula can be determined from the reaction mechanism.

EllerySchlingmann1E
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Joined: Fri Sep 28, 2018 12:24 am

Re: Elementary Reactions and Reaction Mechanisms

Postby EllerySchlingmann1E » Tue Mar 05, 2019 12:36 pm

To answer the second part of your question: the decomposition of O3 to O2 can be hypothesized as occurring by different reaction mechanisms that are each made up of different elementary reactions. The decomposition can occur by a one-step reaction mechanism that is composed of just one elementary reaction between O3 molecules to produce O2, or it can takes place by a two-step mechanism where O acts as an intermediate between the two elementary reactions which make up this mechanism. Hope that helps!


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