Question

What is usually needed to help a decomposition reaction to occur?

a more active second reactant

the addition of energy

the addition of an enzyme

a lower temperature

Answer 1

Answer: the addition of energy

Explanation: A decomposition reaction is one in which one reactant decomposes to produce two or more than two products.

Thus to break the bonds between the reactant molecules, energy has to be supplied. All decomposition reactions are called as endothermic reactions as all of them require energy.

For example:

$CaCO_3\rightarrow CaO+CO_2$