Chemistry
Chemistry is the scientific study of the properties and behavior of matter . [1] It is a physical science under natural sciences that covers the elements that make up matter to the compounds made of atoms , molecules and ions : their composition, structure, properties, behavior and the changes they undergo during a reaction with other substances . [2] [3] [4] [5] Chemistry also addresses the nature of chemical bonds in chemical compounds . In the scope of its subject, chemistry occupies an intermediate position between physics and biology . [6] It is sometimes called the central science because it provides a foundation for understanding both basic and applied scientific disciplines at a fundamental level. [7] For example, chemistry explains aspects of plant growth ( botany ), the formation of igneous rocks ( geology ), how atmospheric ozone is formed and how environmental pollutants are degraded ( ecology ), the properties of