Question

17. Why are decomposition reactions called
the opposite of combination reactions?
wonté equations for these reactionso​

Answer 1

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.

Decomposition reaction CaCO3 (s) ⇨ CaO (s) + CO2 (g)

Combination reaction H2 (g) + Cl2 ⇨ 2HCl (g)

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Answer 2

Answer:

Explanation:Decomposition reaction are called the opposite of combination reaction because in combination reaction two or more reactant form single product and in decomposition reaction single reactant break down to give simpler product.

Combination reaction-

CaO +H2O ----- Ca(OH)2

Decomposition reaction-

CaCO3 +CaO +CO2