Final answer:
Chemical energy is a source of heat or form of energy that is based on the breaking down and recombination of molecules.
Step-by-step explanation:
Chemical energy is a source of heat or form of energy that is based on the breaking down and recombination of molecules. When chemical bonds are broken and new bonds are formed, energy is released. This energy is usually in the form of heat, which is produced as vibrations when molecules recombine.