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The textbook is prepared according to the Chemistry curriculum for grades 7-9 of general secondary education. It contains material from the sections "Repetition of the educational material in chemistry of the 8th grade", "Water. Solutions", "Chemical reactions", "The most important organic compounds", "Generalisation of knowledge in chemistry. Chemistry and Humanity", practical works, laboratory experiments, exercises, tasks, tasks for home and extracurricular experiments, additional material for the curious, as well as a dictionary of chemical terms, subject index, list of references and a list of Internet sites for students.