Properties of Mixture
Properties of Mixture
A mixture is a material containing two or more elements or compounds that are in close contact and mixed together in any proportion. The components of a mixture can be separated by simple mechanical means.
Properties of Mixtures
A mixture may be homogeneous or heterogeneous:
A homogeneous mixture has a uniform composition throughout its mass. There are no visible and sharp boundaries between the various constituents of a homogeneous mixture.
For example, sugar solution is a mixture of sugar in water. A mixture of two miscible liquids, i.e., liquids which mix into one another completely, is also homogeneous. For example, when we mix water with alcohol, we get a homogeneous mixture. Air is a homogeneous mixture of oxygen, nitrogen, carbon dioxide, etc.
A heterogeneous mixture does not have a uniform composition throughout its mass. There are visible and sharp boundaries between the various constituents of such a mixture. For example, a mixture of sand and common salt is heterogeneous. The mixture of two immiscible liquids is also heterogeneous. For instance, when oil and water are mixed together, they get separated into two layers, one above the other. This is because oil and water are immiscible.
The constituents of a mixture can be separated by physical methods such as filtration, evaporation, sublimation and magnetic separation:
Take a mixture of iron filings and sulphur. When a magnet is put in the mixture, the iron particles get attracted to the magnet, stick to it and can thus be separated from the mixture. Sulphur is not attracted to the magnet. When we add carbon disulphide to the mixture, sulphur dissolves in it but in it the iron particles remain unaffected. On filtration, iron can be obtained as a residue.
In the preparation of a mixture, energy is usually neither given out nor absorbed:
During mixing of sugar and sand together, there is no energy change, i.e., energy is neither released nor absorbed.
The composition of a mixture is not fixed:
It varies from one part to another. The constituents of the mixture may be present in any proportion by weight.
A mixture has no definite melting point, boiling point, etc.
In the formation of a mixture, no chemical reaction occurs. :-
The constituents of a mixture do not undergo any change in composition.
From the following identify the heterogeneous mixture. | |||
| Right Option : B | |||
| View Explanation | |||
There are two samples of mixtures. Sample A, and Sample B. In Sample A there are two layers of mixtures, It can be separated by the process of filtration. But in Sample B,it is a mixture of two miscible liquids and we cannot separate the constituents by the process of filtration. What can we say about the samples.
| |||
| Right Option : A | |||
| View Explanation | |||
A sample contains two substances and has uniform properties, The sample is ________________ | |||
| Right Option : D | |||
| View Explanation | |||
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