10. Changes in which now substances are formed are called change
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Answer: Chemical changes
Explanation:
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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irreversible changes
Explanation:
the old substance can't be obtained back from the new one formed
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