Аннотация:The book presents the experimental problems of the last seventeen International Mendeleev Olympiads in chemistry. This is the result of sustained effort of the authors, which included the experimental preparation of the proposed assignments and the compilation of questions for them. In addition, the book lists all participants of the 17 Mendeleev Olympiads and the awards they received. The unique material presented in the book will be useful to anyone interested in chemistry: schoolchildren, colledge students, high school teachers and university professors.