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Recently I have started looking for two reactions that would speed each other up. That means that the products of the first reaction accelerate the second one, and in turn, the products formed in the second reaction accelerate the first one. Do you know any examples of such reactions?

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closed as too broad by Mithoron, airhuff, Jan, bon, Todd Minehardt Oct 21 '17 at 17:36

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Have a look at some non-linear reaction schemes such as gas phase radical chain reactions that may lead to explosion. The propagation steps in the hydrogen/bromine gas phase reaction do what you suggest:

$$\begin{align} \ce{H^. + Br2 &-> HBr + Br^.} \\ \ce{Br^. +H2 &-> HBr + H^.} \end{align}$$

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    $\begingroup$ I don’t quite see where these reactions speed up each other? $\endgroup$ – Jan Sep 13 '17 at 6:38
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    $\begingroup$ @Jan They are part of a bigger scheme and only for illustration, but the product of the first is the reactant to the second and vice versa. $\endgroup$ – porphyrin Sep 13 '17 at 13:32

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