Substances that store chemical energy are primarily fuels such as coal, wood, natural gas, petroleum and propane, as well as foods, batteries and matches. Encyclopædia Britannica defines chemical energy as energy stored in the bonds of chemical compounds that can be released during a chemical reaction.
All chemical energy is potential energy, which is another name for stored energy. Once a chemical reaction occurs, the chemical energy stored in these substances is converted into other types of energy and used for real types of work.
According to eSchooltoday, wood is an example of a store of chemical energy. The wood goes through the chemical reaction of burning, which produces thermal energy in the form of heat and light energy in the form of fire.