Question

combustion reaction are always​

Answer 1

Answer:

exothermic

Explanation:

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Answer 2

Answer:

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Combustion reactions always involve molecular oxygen O2. Anytime anything burns (in the usual sense), it is a combustion reaction. Combustion reactions are almost always exothermic (i.e., they give off heat). ... When organic molecules combust the reaction products are carbon dioxide and water (as well as heat).