Most decomposition reactions require energy either in the form of heat, light or electricity. Absorption of energy causes the breaking of the bonds present in the reacting substance which decomposes to give the product.

What type of energy is decomposition?

Decomposition reactions are usually endothermic, because they need energy to overcome the bond strength between the reactant. The newly formed bonds are responsible for new products, which are usually compounds. Usually, the energy supplied to activate the decomposition reaction comes in the form of heat (fire).

Where does energy go in a decomposition reaction?

The general equation for a decomposition reaction is: AB→A+B. An exchange reaction is a chemical reaction in which both synthesis and decomposition occur, chemical bonds are both formed and broken, and chemical energy is absorbed, stored, and released (see Figure 1c).