Question

7.
Why are decomposition reactions called the opposite of combination reactions? Write equations for
these reactions.​

Answer 1

Answer:

Those reactions in which a compound splits up into two or more simpler substances are known as decomposition reactions.

Example: When calcium carbonate is heated, it decomposes to give calcium oxide and carbon dioxide.

Calcium carbonate Calcium oxide Carbon dioxide

(Limestone) (Lime)

They are called opposite of combination reactions because in a combination reaction, two or more substances combine to form a single substance.

Example: Magnesium and oxygen combine, when heated formed magnesium oxide.

Answer 2

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.

Explanation:

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