Chemistry is a branch of science that is the study of matters and what it consists of, its properties, changes, and chemical reactions between substances. It is often referred to as a central part of science as it studies a whole range of science subjects with the application of physics and mathematics, earth and environment. Chemistry is the branch of the physical sciences that deals with the study of the composition, properties and structure of elements and compounds. It involves study of the transformations the substances undergo and the energy that is released or absorbed during the transformation processes.