Define chemical changes :-
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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.
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A chemical change is a permanent change in which new substance are formed whose chemical composition, physical and chemical properties are different from those of the original substance. Examples :- Burning paper into ash, melting ice cubes into liquid, etc.
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