Textbook for the 11th grade of general secondary education institutions with the Russian language of instruction. This year you continue to study chemistry. You have already accumulated up to a static stock of chemical knowledge. Now it is necessary to generalize them and bring them into the system. The basis for this will be both existing and new theoretical ideas about the nature of interatomic interactions, the structure of matter, the laws of chemical reactions, the chemistry of solutions, and the properties of the main classes of inorganic compounds.