Question

How can a change occur in a substance?

Answer 1

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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

Answer:

A change can occurs in a substance by an alteration in the properties such as colour, texture and the state of the substance since there is formation of a new substance.