What do you understand by a chemical reaction?

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Solution

Chemical reaction - When one or more substances undergo a chemical change with the absorption or liberation of energy so as to form one or more new products, then the change that occurs is collectively known as a chemical reaction.
Example - Carbon and Oxygen combine to form carbon dioxide and liberate heat.
$C (s) + O_{2} (g) \to {CO}_{2} (g) Carbon Oxygen Carbon dioxide$

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