Why is combustion considered to be a chemical change ?
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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).
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because it is start from chemical and when it is change they use oxygen and carbon dioxide.
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