About chemistry can speak long. Thanks to her, in the world there appeared a lot of things. Each of our day goes by without chemistry. We just do not notice it. People dress in chemistry, eat chemistry. Simply we are surrounded by chemicals. And what is this? The science of substances, their properties. The structure and transformations occurring as a result of chemical reactions, as well as laws which these transformations are subject to. The most interesting who invented it. And made it up people themselves. Which to some extent made the world better. But if you look from the other side a little and worsened it. One most important thing in chemistry it is the periodic table Mendeleev.