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Chemistry is the science of matter and its interactions with energy and itself (see physics, biology). Because of the diversity of matter, which is mostly in the form of atoms, chemists often study how atoms of different chemical elements interact to form molecules and how molecules interact with each other.

Branches of chemistry

Chemistry typically is divided into several major sub-disciplines. There are also several main cross-disciplinary and more specialized fields of chemistry.

Analytical chemistry 
Analytical chemistry is the analysis of material samples to gain an understanding of their chemical composition and structure.
Biochemistry is the study of the chemicals, chemical reactions and chemical interactions that take place in living organisms.
Inorganic chemistry 
Inorganic chemistry is the study of the properties and reactions of inorganic compounds. The distinction between organic and inorganic disciplines is not absolute and there is much overlap, most importantly in the sub-discipline of organometallic chemistry.
Organic chemistry 
Organic chemistry is the study of the structure, properties, composition, and reactions of organic compounds.
Physical chemistry 
Physical chemistry is the study of the physical basis of chemical systems and processes. In particular, the energetic description of diverse chemical transformations are of interest to physical chemists. Important areas of study include chemical thermodynamics, chemical kinetics, statistical mechanics, and spectroscopy. Physical chemistry has large overlap with molecular physics.
Theoretical chemistry 
Theoretical chemistry is the study of chemistry via theoretical reasoning (usually within mathematics or physics). In particular the application of quantum mechanics to chemistry is called quantum chemistry. Since the end of the second world war, the development of computers has allowed a systematic development of computational chemistry, which is the art of developing and applying computer codes for solving chemical proplems. Theoretical chemistry has large overlap with molecular physics.
Other fields 
Astrochemistry, Atmospheric chemistry, Chemical Engineering, Electrochemistry, Environmental chemistry, Geochemistry, History of chemistry, Materials science, Medicinal chemistry, Molecular Biology, Nuclear chemistry, Organometallic chemistry, Petrochemistry, Pharmacology, Photochemistry, Polymer chemistry, Supramolecular chemistry, Surface chemistry, and Thermochemistry.

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