## Elementary Reactions and Reaction Mechanisms

$K = \frac{k_{forward}}{k_{reverse}}$

Kimberly 1H
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Joined: Fri Sep 28, 2018 12:17 am
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### Elementary Reactions and Reaction Mechanisms

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
Posts: 60
Joined: Fri Sep 28, 2018 12:26 am

### Re: Elementary Reactions and Reaction Mechanisms

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
Posts: 76
Joined: Fri Sep 28, 2018 12:24 am

### Re: Elementary Reactions and Reaction Mechanisms

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!