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Chemistry (from Egyptian keme (chem), meaning "earth"^[1]) is the science concerned with the composition, structure, and properties of matter, as well as the changes it undergoes during chemical reactions.^[2] It is a physical science for studies of various atoms, molecules, crystals and other aggregates of matter whether in isolation or combination, which incorporates the concepts of energy and entropy in relation to the spontaneity of chemical processes. Modern chemistry evolved out of alchemy following the chemical revolution (1773).

Disciplines within chemistry are traditionally grouped by the type of matter being studied or the kind of study. These include inorganic chemistry, the study of inorganic matter; organic chemistry, the study of organic matter; biochemistry, the study of substances found in biological organisms; physical chemistry, the energy related studies of chemical systems at macro, molecular and submolecular scales; analytical chemistry, the analysis of material samples to gain an understanding of their chemical composition and structure. Many more specialized disciplines have emerged in recent years, e.g. neurochemistry the chemical study of the nervous system (see subdisciplines).

Chemistry is the scientific study of interaction of chemical substances^[3] that are constituted of atoms or the subatomic particles protons, electrons and neutrons.^[4] Atoms combine to produce molecules or crystals. Chemistry is often called "the central science" because it connects the other natural sciences, such as astronomy, physics, material science, biology, and geology.^[5][6]

The genesis of chemistry can be traced to certain practices, known as alchemy, which had been practiced for several millennia in various parts of the world, particularly the Middle East.^[7]

Chemistry Subcategories Chemistry Articles Body Building Supplements And Importance Of Chemistry by Suzie Goldie Nov 17, 2008 While it’s tempting to buy the hottest body building supplements on the market, it’s important to realize the underlying chemistry of these supplements and how that chemistry affects the body. While attempting to increase muscle size, these supplemen... How Can Noni Xeronin Help You? by Dean Iggo Dec 20, 2006 Xeronin is an alkaloid that is found in Noni Juice. Many say it is one of the most important components of the human body, though the medical industry has published little recognized research on it. Despite all of the wonderful things it can do... the chemistry and economy of soup-making. by John Ugoshowa Nov 24, 2006 Stock being the basis of all meat soups, and, also, of all the principal sauces, it is essential to the success of these culinary operations, to know the most complete and economical method of extracting, from a certain quantity of meat, the ... Top Three Noni Juice Ingredients by Dean Iggo Nov 21, 2006 There are many different Noni Juice ingredients you should be aware of. Noni Juice has been hailed as one of the most important health food supplements of our time. Studies show that it can help with a number of different existing health cond... Can Motherhood Make You Smarter? by Mary Desaulniers Nov 23, 2005 Copyright 2005 Mary Desaulniers It was not too long ago that the I.Q. test was a routinely administered exercise in elementary and secondary schools. At that time (late seventies and early eighties), schools placed great faith in these magic nu... Suppression of nitric oxide production in mouse macrophages by soybean flavonoids accumulated in response to nitroprusside and fungal elicitation Jun 17, 2005 Suppression of nitric oxide production in mouse macrophages by soybean flavonoids accumulated in response to nitroprusside and fungal elicitation Loren S Scuro1 , PU Simioni2 , DL Grabriel2 , Elzira E Savi... Increasing stability of water-soluble PQQ glucose dehydrogenase by increasing hydrophobic interaction at dimeric interface Jun 17, 2005 Increasing stability of water-soluble PQQ glucose dehydrogenase by increasing hydrophobic interaction at dimeric interface Shunsuke Tanaka , Satoshi Igarashi , Stefano Ferri and Koji Sode Department of Biotechnology, Tokyo Uni...