Since time immemorial, man has used chemical reactions to meet his needs. In ancient times, the fire warmed and fed a person. The use of chemical processes for the conversion of ores to metals led to the replacement of stone tools with metal ones. Faced with chemical reactions in nature, man began to study them and increasingly apply them. The growth of human needs for food, clothing, various materials contributed to the development of chemistry. Nowadays, scientific and technological progress is impossible without the achievements of chemistry.