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Chemistry | Definition, Topics, Types, History, Facts | Britannica Cooking, fermentation, glass making, and metallurgy are all chemical processes that date from the beginnings of civilization Today, vinyl, Teflon, liquid crystals, semiconductors, and superconductors represent the fruits of chemical technology
Chemical compound | Definition, Examples, Types | Britannica Chemical compound, any substance composed of identical molecules consisting of atoms of two or more chemical elements All the matter in the universe is composed of the atoms of more than 100 different chemical elements, which are found both in pure form and combined in chemical compounds
Chemical element | Definition, Origins, Distribution, Facts - Britannica A chemical element is any substance that cannot be decomposed into simpler substances by ordinary chemical processes Elements are the fundamental materials of which all matter is composed Learn more about the origins, distribution, and characteristics of chemical elements in this article
Chemical formula | Definition, Types, Examples, Facts | Britannica chemical formula, any of several kinds of expressions of the composition or structure of chemical compounds The forms commonly encountered are empirical, molecular, structural, and projection formulas
Chemical energy | Definition Facts | Britannica chemical energy, Energy stored in the bonds of chemical compounds Chemical energy may be released during a chemical reaction, often in the form of heat; such reactions are called exothermic
Chemical kinetics | Definition, Equations, Facts | Britannica Chemical kinetics, the branch of physical chemistry that is concerned with understanding how fast or how slow chemical reactions occur (that is, their rates) The principles of chemical kinetics apply to purely physical processes as well as to chemical reactions