The great need of chemistry students for an easily accessible textbook forced the author to re-publish the book, which he wrote together with his colleague Dr. E. Rabinovich in 1930. It is composed as a "tutorial" in the form of questions and answers. When reading a book, the reader will be able to get only a short and unambiguous answer to the most important questions that in textbooks are the result of a long presentation, to also get coverage, an explanation of the chemical problems underlying these questions.