what is 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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CHANGES IN THE THEIR CHEMICAL PROPERTIES or compostion .resulting in the formation of at least one new substance.chemical reaction involving the rearrangement of the atoms of one or more substance.
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