The school chemistry course has just begun, and you are already confused in all the variety of chemical elements? Or maybe, on the contrary, you are easily given this subject, and you can independently compose the equation of any chemical reaction? In any case, our book will be useful to you! You will learn what a substance is and what its composition is, what chemical compounds are the most common, what properties metals have and how they differ from non-metals, and, finally, what substances are the most important for the human body. And most importantly, this book is written simply and interestingly. Unlike school textbooks, there are no incomprehensible terms and complex scientific theories - only colorful illustrations, understandable schemes, analogies and comparisons. For middle and high school age.