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Decomposition involves chemical reactions and as a rough approximation, for many chemical reactions happening at around room temperature, the rate of reaction doubles for every 10°C rise in temperature.

The reason for this is that for chemical reactions to happen, at the smallest scale, the individual chemical molecules have to bump into one another. As molecules warm up they begin to vibrate more and the chances of them bumping in to one another increases - the more bumps that happen, the faster the reactions go.

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Q: How does heat speed up decomposition?
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