Question

why are decomposing reactions called the opposite of combination reactions

Answer 1

Hey buddy here is your answer

In a combination reaction two or more substances are combined to form new substance while in the decomposition reaction one substance decomposes into two or more substances. Hence, the decomposition reactions are called opposite of combination reactions.

Answer 2

:In Decomposition reaction a single substance decomposes to form two or more substances which is exact opposite of Combination reaction in which two or more reactants combine to form a single product that is why decomposition reactions called the opposite of combination reactions.