- 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 reaction | Definition, Equations, Examples, Types - Britannica
A chemical reaction is a process in which one or more substances, the reactants, are converted to one or more different substances, the products Substances are either chemical elements or compounds
- 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 synthesis | Organic Inorganic Reactions | Britannica
chemical synthesis, the construction of complex chemical compounds from simpler ones It is the process by which many substances important to daily life are obtained It is applied to all types of chemical compounds, but most syntheses are of organic molecules
- 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 change | Britannica
A chemical change (that is, a chemical reaction) is one in which the organization of the atoms is altered An example of a chemical reaction is the burning of methane in the presence of molecular oxygen (O 2) to form carbon dioxide (CO 2) and…
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