Question

Why energy is involved in a chemical change?

Answer 1

Due to the absorption of energy when chemical bonds are broken, and the release of energy when chemical bonds are formed, chemical reactions almost always involve a change in energy between products and reactants. ... This stored chemical energy, or heat content, of the system is known as its enthalpy.

Answer 2

Answer:

Chemical reactions often involve changes in energy due to the breaking and formation of bonds. Reactions in which energy is released are exothermic reactions, while those that take in heat energy are endothermic reactions.