Question

Why does endothermic reaction need to break chemical bonds?

Answer 1

To start a reaction, energy must be absorbed by the chemicals in order to breaksome of the chemical bonds in the reactants. The amount of energy needed to start a reaction in this way is called the activation energy. ... Breaking the chemical bonds in the reactants always requiresenergy – it is an endothermic process.

Answer 2

Explanation:

Bond breaking is an endothermic process, because it requires energy. Bond forming is an exothermic process, because it releases energy. In reaction profile diagram, the energy change in a reaction, is the difference between the reactants and products.