The book is a collection of tasks that were developed and proposed at various stages of the chemical Olympiad, mainly at the Moscow City and Regional Olympiads for schoolchildren. The purpose of this manual is to help students interested in chemistry learn how to solve any problems, from the simplest to the most difficult, within the framework of the school chemistry course and the elective program based on a clear systematization of tasks and their structuring by general types and methods of solving. For high school students and chemistry teachers, students of the vocational education system.