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 ?
For the addition of cement in the mixture of iron ore tailings with optimum levels of compression under Normal and Intermediate energies, we adopted the percentages 3, 4 and 5% cement and curing periods of 3, 7, and 28 days in a humid chamber at 23 [+ or -] 2[degrees]C and relative humidity greater than 95%.
The mixture called 60f-40c, when applied in the mechanical analysis test, with the addition of 5% CPII-E-32 cement, will hereinafter be called as 60f-40c+5% CPII-E-32.
Moreover, the VE values decrease with increasing temperatures of the 2,5 hexandione + cyclohexanol mixture, which leading of increase in intermolecular interactions between the component molecules with arising temperature, which is probably due the greater thermal agitation that ultimately increases the mutual fitting of the mixing components to some extent at higher temperatures.while we were observing opposite behavior for hexandione + cyclopentanol mixture.
n 1, n2 and nmix are the viscosity of component 1 and 2 and mixture respectively, Vmix was calculated from equation (4) below.
Reserve one squeeze bottle of pancake mixture for making the outline.
The outline is important as this serves as your guide when pouring the mixture, and it also keeps the pancake mixture from spreading.
The mixture specimens are 39.1 mm in diameter and are trimmed to 80 mm height.
To easily distinguish the four types of mixtures, the names for mixtures are called by KS (asphalt mixture using general binder), K1 (asphalt mixture using KTR-101 binder), K2 (asphalt mixture using KTR-201 binder), and K4 (asphalt mixture using KTR-401H binder) in this paper.
Out of concerns that this variability might complicate dose-response analyses and create serious difficulties during the interpretation of mixture experiments, we took steps to improve the reproducibility of assay responses by working with a tightly controlled age range of fetal testes (GW 10-12).
Add enough milk to make a soft mixture that drops off your spoon.
Highly significant differences at pless than 0.01 were observed for average wet weight (g), fork and total length (mm) increments in metals mixture stressed fish as compared to control group and also among five fish species.