# Chemical Formulas A **chemical formula** is used to describe the properties of a specific chemical species. [[Chemical Equations]], on the other hand, are used to visualized the behavior of a chemical reaction, meaning that it involves multiple compounds. > **Isomers** are molecules that share a molecular formula (meaning they have the same numbers of atoms for ever present element) but have differences in their structural arrangement. --- ### Empirical Formula A formula giving the proportions of the elements present in a compound but not the actual numbers or arrangement of atoms It is the simplest whole number ratio of the elements in a molecule --- ### Molecular Formula --- ### Structural Formula