Question

why are chemical reaction accompanied by energy change?​

Answer 1

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.

Key Terms

endothermic: A description of a chemical reaction that absorbs heat energy from its surroundings.

enthalpy: In thermodynamics, a measure of the heat content of a chemical or physical system. The change in enthalpy of a chemical reaction is symbolized

Answer 2

Question: Why are chemical reaction accompanied by energy change?​                                  

Explanation:

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.