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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