Question

Define Chemical change.
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Answer 1

Answer:

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..

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Answer 2

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The change in which the molecular composition is completely altered and a new product is formed is called a chemical change. ... During a chemical change, the energy changes occur. There is an energy difference in the breaking of old bonds in reactants and the formation of new bonds in products.

A change in which one or more new substances are formed is called as a chemical change. Usually a chemical change involves a chemical reaction, which forms new products. Example : Rusting of Iron, or burning wood.

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