Definition of chemical energy
Chemical energy is a very hidden energy. It cannot be used directly for work. It can only be released when chemical changes occur, and it can be converted into thermal energy or other forms of energy. Energy such as the burning of oil and coal, the explosion of explosives, and the chemical changes in the food eaten by humans are all chemical energy. Chemical energy refers to the energy stored in matter. According to the law of conservation of energy, the change in this energy is equal to the change in thermal energy in the reaction, with the opposite sign. When the atoms of the participating compounds are rearranged to produce a new compound, Changes in chemical energy will result in exothermic or endothermic effects.