Question

Why does a chemical change always involve an absorption or liberation of energy?

Answer 1

Endothermic Reactions. Endothermic reactions, on the other hand, absorb heat and/or light from their surroundings. ... This means that the energy required to break the bonds in the reactants is more than the energy released when new bonds form in the products; in other words, the reaction requires energy to proceed.

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Answer 2

because in chemical change atoms rearrange themselves
in breaking up of reactant molecules and making up of product molecules
the energy involved in both cases is not same. so chemical reaction are.......