If heat is supplied to the reaction, it is endothermic reaction. If heat is evolved during a reaction it is called exothermic reaction.
In every chemical process, energy is involved. When new bonds form in products, energy is produced. Energy is used to break bonds in reactants.
When new bonds form in the products of some chemical reactions, known as endothermic reactions, less energy is released than is required to break bonds in the reactants.
Exothermic reactions work the other way around. It requires less energy to break bonds in the reactants than is produced when new bonds form in the products in an exothermic reaction.
Exothermic reactions characterize all combustion processes. A substance burns when it reacts with oxygen in a combustion reaction. Burning materials often release energy in the form of heat and light.
Therefore, If heat is supplied to the reaction, it is endothermic reaction. If heat is evolved during a reaction it is called exothermic reaction.
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