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mixture

mixture, in chemistry, a physical combination of two or more pure substances (i.e., elements or compounds). A mixture is distinguished from a compound, which is formed by the chemical combination of two or more pure substances in a fixed, definite proportion. The components of a mixture retain their own chemical properties and may be present in any proportion. For example, iron filings may be mixed with powdered sulfur in any proportion, and even if very fine iron powder is carefully mixed with powdered sulfur, the two components are easily separated by means of a magnet; the magnet will draw out the iron from the mixture. However, if seven parts by weight of iron filings or powder are mixed with four parts by weight of powdered sulfur and the mixture is heated to a red glow (e.g., in a test tube, using a Bunsen burner), the iron and sulfur react to form the compound iron sulfide; they are chemically combined and are not readily separated. The iron sulfide is not attracted by a magnet. Mixtures are often classified as homogeneous or heterogeneous. Solutions and colloids are homogeneous mixtures. The components of a homogeneous mixture are too intimately combined to be distinguished from one another by visual observation. A suspension is a heterogeneous mixture. The particles in a heterogeneous mixture are coarse enough to be distinguished by visual observation. Alloys are mixtures of metals and may be either homogeneous or heterogeneous. The components of a mixture usually can be separated by physical means such as distillation, evaporation, precipitation, filtration, solvent extraction, or chromatography.

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"mixture." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 21 Oct. 2017 <http://www.encyclopedia.com>.

"mixture." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (October 21, 2017). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/mixture

"mixture." The Columbia Encyclopedia, 6th ed.. . Retrieved October 21, 2017 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/mixture

mixture

mix·ture / ˈmikschər/ • n. a substance made by mixing other substances together: form the mixture into a manageable dough | shandy is a mixture of beer and lemonade. ∎  the process of mixing or being mixed. ∎  (a mixture of) a combination of different qualities, things, or emotions in which the component elements are individually distinct: she thumped the pillow with a mixture of anger and frustration the old town is a mixture of narrow medieval streets and 18th-century architecture. ∎  a person regarded as a combination of qualities and attributes: he was a curious mixture, an unpredictable man. ∎  Chem. the product of the random distribution of one substance through another without any chemical reaction, as distinct from a compound. ∎  the charge of gas or vapor mixed with air that is admitted to the cylinder of an internal combustion engine, esp. as regards the ratio of fuel to air: newer pilots often leave their mixture rich during an entire flight. ∎  (also mixture stop) an organ stop in which each key sounds a group of small pipes of different pitches, giving a very bright tone.

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"mixture." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. 21 Oct. 2017 <http://www.encyclopedia.com>.

"mixture." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. (October 21, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/mixture-0

"mixture." The Oxford Pocket Dictionary of Current English. . Retrieved October 21, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/mixture-0

mixture

mixture In chemistry, two or more substances that retain their specific identities when mixed (such as air containing oxygen, nitrogen, and other gases). The identities remain separate no matter in what proportion or how closely the components are mixed. See also compound; solution

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"mixture." World Encyclopedia. . Encyclopedia.com. 21 Oct. 2017 <http://www.encyclopedia.com>.

"mixture." World Encyclopedia. . Encyclopedia.com. (October 21, 2017). http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/mixture

"mixture." World Encyclopedia. . Retrieved October 21, 2017 from Encyclopedia.com: http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/mixture

mixture

mixture XV. — F. mixture or L. mixtūra, f. mixt-, pp. stem of miscēre; see MIX and -TURE.

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"mixture." The Concise Oxford Dictionary of English Etymology. . Encyclopedia.com. 21 Oct. 2017 <http://www.encyclopedia.com>.

"mixture." The Concise Oxford Dictionary of English Etymology. . Encyclopedia.com. (October 21, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/mixture-1

"mixture." The Concise Oxford Dictionary of English Etymology. . Retrieved October 21, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/mixture-1

mixture

mixturecatcher, dacha, focaccia, patcher, scratcher, snatcher, stature, thatcher •facture, fracture, manufacture •capture, enrapture, rapture •flycatcher • oystercatcher •archer, departure, kwacha, marcher, starcher, viscacha •pasture •etcher, fetcher, fletcher, lecher, sketcher, stretcher •conjecture, lecture •sepulture •denture, misadventure, peradventure •divesture, gesture, vesture •texture • architecture • nature •magistrature •bleacher, creature, feature, headteacher, Katowice, Nietzsche, preacher, screecher, teacher •schoolteacher •ditcher, hitcher, pitcher, stitcher, twitcher •Chibcha •picture, stricture •filcher • simcha •cincture, tincture •scripture •admixture, commixture, fixture, intermixture, mixture •expenditure • forfeiture •discomfiture • garniture •primogeniture, progeniture •miniature • furniture • temperature •portraiture • literature •divestiture, vestiture

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"mixture." Oxford Dictionary of Rhymes. . Encyclopedia.com. 21 Oct. 2017 <http://www.encyclopedia.com>.

"mixture." Oxford Dictionary of Rhymes. . Encyclopedia.com. (October 21, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/mixture

"mixture." Oxford Dictionary of Rhymes. . Retrieved October 21, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/mixture