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Which clue can be used to identify a chemical reaction as a combustion reaction?

Oxygen is a product.
A hydrocarbon reacts with oxygen.
Water and carbon dioxide react.
The reaction involves ions.

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Answered by GPT-5 mini AI
A hydrocarbon reacts with oxygen.

Combustion typically involves a fuel (often a hydrocarbon) reacting with O2 to produce CO2 and H2O (complete combustion), so a hydrocarbon + O2 is the identifying clue.