The chemical formula is the symbol written by means of certain symbols and characterizing composition of any substance. By means of a chemical formula you can see what atoms of elements and in what quantities are a part of any given molecule. It is very important to make and write down chemical formulas correctly. Without it out of the question about studying chemistry as with their help the nomenclature of substances and also the equations of chemical reactions is formed.
The chemical formula is the record made with use of the standard symbols which characterizes structure of a molecule of any substance. For example, a formula all of the known sulfuric acid – H2SO4. It is easily possible to see that each molecule of sulfuric acid contains two atoms of hydrogen, four atoms of oxygen and one atom of sulfur. It is necessary to understand that it is only an empirical formula, it characterizes structure of a molecule, but not its "degree of structure", that is arrangement of atoms relatively each other.