Question

what do you mean by a chemical change​

Answer 1

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A chemical change occurs when a new substance is formed through a chemical reaction like when fruit ripens or rots. When something undergoes a "chemical reaction" and a new substance is formed as a result, we call this chemical change.The iron reacts with water and oxygen to create a new substance — rust.

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Answer 2

Explanation:

When a substance combines with another to form a new substance, called chemical change. It is a Irreversible change