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Chemical energy is the easiest and most efficient energy source to store and utilize, if only because it is so readily available, found in nearly everything we use. Chemical energy, as used by our bodies has been the source of life for billions of years and the developments in chemical energy technology has led to long lasting rechargeable batteries and hopefully in renewable energy resources in the future.
Chemical energy is a form of potential energy related to the structural arrangement of atoms or molecules. This arrangement may be the result of chemical bonds within a molecule or otherwise. Chemical energy of a chemical substance can be transformed to other forms of energy by a chemical reaction. For example, when a fuel is burned the chemical energy is converted to heat, same is the case with digestion of food metabolized in a biological organism. Green plants transform solar energy to chemical energy through the process known as photosynthesis, and electrical energy can be converted to chemical energy through electrochemical reactions