eli5: What exactly happens when you burn food (I.e Toast)?

Question

eli5: What exactly happens when you burn food (I.e Toast)?

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Answer 1

Chemically speaking, all food is just an assortment of certain organic compounds. All organic compounds are essentially chains of carbon and other atoms attached in unique ways. When you burn food, you heat up those organic compounds so that the other atoms begin to break off and form other bonds. All that’s left are rings of carbon aka “ash”