Chemistry books say: most of the energy needed by humans is produced by chemical reactions, most commonly the use of household fuels, such as the use of chemical reactions to produce

1, most of the heat energy needed by mankind is obtained by chemical changes, mainly combustion. Thus, the conversion of thermal energy to get electrical energy, light energy, mechanical energy and so on. As for the reactants and products, generally some organic fuels (such as methane: CH4, ethanol: C2H6O, etc.) and oxygen reaction, the formation of water and carbon dioxide, if the combustion is not sufficient may also generate carbon black and carbon monoxide.

2, produced by chemical reactions in the life of the fuel "water gas" (water and carbon as raw materials), methane (some organic matter through the decomposition of microorganisms to get) and fossil fuels, that is, coal, petroleum and natural gas, which are ancient times, the bodies of plants and animals after a long and complex chemical changes, in which the coal can be obtained through a variety of chemical changes. Coal, in turn, can be obtained through various chemical changes such as coke and diesel.

3, if you do not count the electric heater, cooking and heating is utilized to burn, cooking is generally utilized in the combustion of methane or carbon monoxide, furnace heating is utilized in the combustion of firewood or coal, heating is utilized in the combustion of coal.

4, the current use of combustion to generate electricity is mainly the use of combustion of water heated into high temperature steam, the use of steam to drive a turbine, driven by a coil to cut the magnetic lines of force, so as to obtain electricity.