define chemical change
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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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the change that can't be reversible and a new substance is formed in this change
Example:-
- burning of paper
- burning of wood
they both will release ash after burning which is new substance
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