Question

define chemical change​

Answer 1

Answer:

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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.

Answer 2

The change in which a substance or substances are converted into a new substance or substances, possessing properties altogether different from the original ones, is called a chemical change. During this change, the original substance cannot be recovered by any simple means. This change is permanent.