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Meaning of an activation energy in a chemical reaction

Answer Text:
Activation energy.
- Is the energy required to activate the reactants before a reaction can take place.
- Thus activation energy is the energy required to initiate a reaction.
- The size of activation energy will differ from one reaction to another and so will be the gap between the energy of reactants and the energy is products.

-At A; bonds are being broken and the energy is absorbed.
-At B; bonds are now being formed, and so energy is evolved.