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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 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
Natural gas - Composition, Properties, Uses | Britannica Natural gas - Composition, Properties, Uses: Natural gas is a hydrocarbon mixture consisting primarily of saturated light paraffins such as methane and ethane, both of which are gaseous under atmospheric conditions The mixture also may contain other hydrocarbons, such as propane, butane, pentane, and hexane In natural gas reservoirs even the heavier hydrocarbons occur for the most part in
Cement - Composition, Properties, Major Cements | Britannica Chemical composition Portland cement is made up of four main compounds: tricalcium silicate (3CaO · SiO 2), dicalcium silicate (2CaO · SiO 2), tricalcium aluminate (3CaO · Al 2 O 3), and a tetra-calcium aluminoferrite (4CaO · Al 2 O 3 Fe 2 O 3)
Chemical bonding | Definition, Types, Examples | Britannica This article begins by describing the historical evolution of the current understanding of chemical bonding and then discusses how modern theories of the formation of chemical bonds have emerged and developed into a powerful description of the structure of matter