Question

what is chemical changes ?
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Answer 1

The changes in which new substance are formed,are called chemical changes. In a chemical change,the substances involved change their identity ie they get converted into entirely new substance. For Ex:Burning of magnesium ribbon,Rusting of iron,Formation of curd from milk,Cooking of food etc.

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Answer 2

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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