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 classic literature ?
He had, however, a happy mixture of pliability and perseverance in his nature; he was in form and spirit like a supple-jackÄyielding, but tough; though he bent, he never broke; and though he bowed beneath the slightest pressure, yet, the moment it was away--jerk
But then again, he MIGHT stay white--I had never used that mixture before.
New Hampshire, whose constitution was the last formed, seems to have been fully aware of the impossibility and inexpediency of avoiding any mixture whatever of these departments, and has qualified the doctrine by declaring "that the legislative, executive, and judiciary powers ought to be kept as separate from, and independent of, each other AS THE NATURE OF A FREE GOVERNMENT WILL ADMIT; OR AS IS CONSISTENT WITH THAT CHAIN OF CONNECTION THAT BINDS THE WHOLE FABRIC OF THE CONSTITUTION IN ONE INDISSOLUBLE BOND OF UNITY AND AMITY.
But," said Morrel, "I thought this mixture, of which you now take four spoonfuls, was prepared for M.
The winter passed by in the ordinary manner in which other winters pass in this climate, being a mixture of mild, delightful days, clear sky, and invigorating sun, and of intense, cold, raw winds, and snow storms.
Stopcocks, of which one has an orifice twice the size of the other, communicate between these receptacles and a fourth one, which is called the mixture reservoir, since in it the two gases obtained by the decomposition of the water do really commingle.
Doctor South asked his assistant how he expected to make both ends meet if he gave a fisherman with a stomach-ache a mixture consisting of half a dozen expensive drugs.
Who that cares much to know the history of man, and how the mysterious mixture behaves under the varying experiments of Time, has not dwelt, at least briefly, on the life of Saint Theresa, has not smiled with some gentleness at the thought of the little girl walking forth one morning hand-in-hand with her still smaller brother, to go and seek martyrdom in the country of the Moors?
Queer lessons, I fancy; and what have you learned from this remarkable mixture, I should like to know?
It is unfortunately impossible to trace the plan of the poem, which presumably detailed the adventures of this unheroic character: the metre used was a curious mixture of hexametric and iambic lines.
This cylinder was composed of a mixture of clay and sand, with the addition of a little hay and straw.
Undoubtedly, he said, the form of government which you describe is a mixture of good and evil.