What is chemical changes?

Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions.

Simple -

A chemical change is usually an irreversible change involving the rearrangement of the atoms of one or more substances and a change in their chemical properties or composition, resulting in the formation of at least one new substance

Explanation:

Examples:- Rusting of iron, Burning of wood, Digestion of food, Cooking etc

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where is the

its temperature is increasing. this causes molecular vibrations to increase.