One type of energy is chemical energy, the energy that is created or released in a chemical reaction.
Chemical energy is stored in the chemical bonds of atoms and molecules. It can only be seen when it is released in a chemical reaction. When chemical energy is released, the substance from which the energy came is often changed into an entirely different substance.
Many substances and objects store and release chemical energy:
- When petroleum is a vapor it is natural gas.
- When petroleum is a liquid it is crude oil.
It can be used to create electricity and heat and can be found in propane, jet fuel, gasoline and other products.
As these examples show, there is lots of stored chemical energy in objects you interact with every day.