Methods, definitions and basic concepts in chemistry. Atoms, molecules, ions and compounds. Basic chemical reactions and reactions in aqueous solutions. Thermochemistry. The electron composition of the atom, periodicity, chemical bonds and molecular structure. Gases, liquids and solids and intermolecular forces. Solutions. Basics of chemical kinetics. Chemical equilibrium. Acids and alkali. Spontaneity of chemical reactions. Electrochemistry. The atomic nucleus and nuclear chemistry. Fundamentals of chemical calculations (the amount of substance, elemental analysis, calculating plural ratios from chemical reactions in gas and solution mixtures).