This book may be recommended for chemistry teachers. The experiments proposed in it are described in several versions. This will give the teacher the opportunity to choose the most suitable ones for a specific class, school. The main attention in the manual is drawn to the description of the experimental technique; general guidelines for conducting experiments in lessons and extracurricular activities are also given. The "Cards of demonstration experiments" contain the most rational versions of the experiments described in the main text. The cards indicate: equipment for each experience, work technique, observed phenomena and their essence.