why is cooking of food an irreversible change?
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The definition of a chemical change is when one or more new substances have been made. Also chemical change cannot be reversed by simple physical means e.g. if the change was brought about by heating then cooling the product won't get you the original substances. So boiling water is not a chemical change (as you can re-condense the steam) whereas boiling an egg IS as the protein has been permanently changed (denatured).
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The cooking of food is an irreversible change as the ingredients used in the cooking of food cannot be obtained back. Example - it is impossible to get back a boiled or cooked egg into a raw egg.
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