This encyclopedia will be of interest to everyone who is fond of one of the most entertaining and vital sciences today - chemistry. The information presented here about the basic elements from which the world was created, about the processes that gave rise to life on Earth, about the reactions without which our daily existence is impossible, will be useful both at school and at home. And curious facts and explaining colorful illustrations will help answer all-all-all questions of young clever people. Acquaintance with this publication will undoubtedly ignite the desire for knowledge in the guys.