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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)
Weathering | Physical, Chemical Biological Effects | Britannica Rock alteration usually involves chemical weathering in which the mineral composition of the rock is changed, reorganized, or redistributed The rock minerals are exposed to solution, carbonation, hydration, and oxidation by circulating waters
Water - Properties, Structure, Chemistry | Britannica Water undergoes various types of chemical reactions One of the most important chemical properties of water is its ability to behave as both an acid (a proton donor) and a base (a proton acceptor), the characteristic property of amphoteric substances