Question

Why are decomposition reactions called opposite of
combination reactions? Write equations for these
reactions.
[3]
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Answer 1

Explanation:

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.

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Answer 2

Explanation:

decomposition reactions a single substance decomposes to form two or more substances.

begin mathsize 12px style C a C O subscript 3 space rightwards arrow with H e a t space on top space C a O space plus space C O subscript 2 end style

In combination reaction in two or more reactants combine to form a single product.

CaO + CO2 → CaCO3 + Energy

From above examples, it is clear that the two reactions are exactly opposite to each other because of that, decomposition reactions are called opposite of combination reactions