mixture

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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. Solutionssolution,
in chemistry, homogeneous mixture of two or more substances. The dissolving medium is called the solvent, and the dissolved material is called the solute. A solution is distinct from a colloid or a suspension.
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 and colloidscolloid
[Gr.,=gluelike], a mixture in which one substance is divided into minute particles (called colloidal particles) and dispersed throughout a second substance. The mixture is also called a colloidal system, colloidal solution, or colloidal dispersion.
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 are homogeneous mixtures. The components of a homogeneous mixture are too intimately combined to be distinguished from one another by visual observation. A suspensionsuspension,
in chemistry, mixture of two substances, one of which is finely divided and dispersed in the other. Common suspensions include sand in water, fine soot or dust in air, and droplets of oil in air. A suspension is different from a colloid or solution.
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 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.

mixture

[′miks·chər]
(pharmacology)
A liquid medicine prepared by adding insoluble substances to a liquid medium, usually with a suspending agent.
(science and technology)
The product of mixing; components are not in a fixed proportion to each other.

mixture

1. The assembled, blended, commingled ingredients of mortar, concrete, or the like.
2. The proportions for their assembly.

mixture

1. Chem a substance consisting of two or more substances mixed together without any chemical bonding between them
2. Pharmacol a liquid medicine in which an insoluble compound is suspended in the liquid
3. Music an organ stop that controls several ranks of pipes sounding the upper notes in a harmonic series
4. the mixture of petrol vapour and air in an internal-combustion engine
References in periodicals archive ?
Gas mixtures are used in electronics, fabrication of specialty alloys, lasers, metals, and other industrial applications.
Density and air content values of concrete mixtures in respect to the quantity of sand (fraction 0/1) are given in the Figure 2.
However, histological and biochemical changes may occur in fish due to persistence of metals in the form of mixtures above the tolerance limits of fish (Bu-Olayan and Thomas, 2004).
Under the new approach, the Commission will identify priority mixtures to be assessed, ensure that different elements of EU legislation deliver consistent risk assessments for such priority mixtures and fill in gaps in the scientific knowledge needed to assess the mixtures.
2] mixture through electrolysis of water, has significant potential to overcome these problems.
For instance, if your target is a mixture of 3% solids, a 2% mixture will result in the rubber sticking to itself and may require rework.
Dehalococcoides ethenogenes transformed the octa-BDE mixture into five-, six-, and seven-bromine forms but did not alter deca-BDE.
Fill each muffin cup with ham and cheese mixture, dividing evenly.
The team determined dose-response information for each constituent chemical before the mixture was tested.
Species mixtures included a drought resistant grass/legume mixture (orchardgrass/red clover) and two five-species mixtures composed of a variety of resistant and susceptible grasses, legumes, and forbs.
However, the key to vein reduction compound use is to be careful when adding the compounds into core sand mixtures, as they can result in varying degrees of reduction in mold tensile properties.