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Fire isn't a substance or an element, (despite what RPGs and Alchemists may have led you to believe) so it technically can't react.

But if cornstarch was set on fire, it would probably follow a standard combustion reaction:

(hydrocarbon) + O2 -> H2O + CO2.

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13y ago
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6mo ago

Cornstarch is a carbohydrate polymer made up of glucose molecules. When exposed to high temperatures like fire, the starch molecules break down through pyrolysis, a chemical reaction that decomposes the starch into smaller compounds like carbon dioxide, water vapor, and char. The char is what typically appears as the black residue in a burning process.

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Q: How does cornstarch chemically react to fire?
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