RECOMMENDED LESSONS: Chemical energy. Chemical Energy is energy stored in the bonds of chemical compounds (atoms and molecules). It is released in a chemical reaction, often producing heat as a by product (exothermic reaction) . Batteries, biomass, petroleum, natural gas, and coal are examples of stored chemical energy.he dry wood is a store of chemical energy. As it burns in the fireplace, chemical energy is released and converted to thermal energy (heat) and light energy. Notice that the wood now turns into ashes (a new substance). Food is also a good example of stored chemical energy.