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# Types of Mixtures

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 Sub Topics Mixtures are made up of two or more substances. All elements and compounds are pure substances. Most substances around us are mixtures of two or more elements or compounds. Two or more substances mixed ultimately in nay ratio, without involving chemical reaction give rise to a mixture. Broadly speaking if a chemical reaction takes place, the mixture of constituents is converted into compound. If the chemical reaction does not take place, the mixture of constituents remains a mixture. A mixture is an impure substance made of two or more elements combined physically in any proportions by mass.

## Definition

Mixture are a combination of the properties of the constituent elements or substances. The smallest particle of a mixture is the same as the smallest particle of each constituent. Samples of a given mixture differ in their properties. The constituents of a mixture can be separated by simple physical means. The formation of a mixture is not accompanied by the absorption or the evolution of heat.

A mixture has no definite molecular formula and it has no characteristic melting and boiling point. Based on their composition, mixtures can be of the following types.

Mixtures can also be classified on the basis of nature of the constituents.
• Solid + solid mixtures
• Solid + Liquid mixtures
• Liquid + Liquid mixtures
• Liquid + Liquid mixtures
• Liquid + Gas mixtures
• Gas + Gas mixtures

## Homogenoeous Mixture

Homogeneous mixtures have uniform composition and properties in all parts. These mixtures are those in which the composition and the properties are the same throughout the mixture. Sometimes it is hard to tell whether something is a mixture. The mixture is clear and the salt is not visible. A mixture like this is called a solution. The homogeneous mixtures of liquids and solids are called solutions.

Normally a homogeneous mixture is not obtained if both the components are solid. Perfect mixing becomes improbable in such cases and composition varies from point to point. There is a possibility of obtaining homogeneous mixtures with liquid components. For example, a mixture of water and alcohol on stirring will provide a homogeneous mixture. Salt solution, sugar solution a mixture of ethyl alcohol and water are examples of homogeneous mixtures.

## Heterogeneous Mixture

Heterogeneous mixtures do not have uniform composition and properties throughout. A heterogeneous mixture is one in which the composition is different parts of the mixture. Heterogeneous mixtures are those mixtures in which the composition and properties vary in different parts of the mixture.

Sand mixed in water is an example of a heterogeneous mixture. As the sand settles down the upper layer contains more water and less sand whereas the lower layer contains more sand and less water. A mixture of iron and sulphur is a heterogeneous mixture.

## Homogeneous Vs Heterogeneous

Depending upon the physical state of the compounds of a given mixture, it can be classified into two categories.
• Homogeneous mixture
• Heterogeneous mixture

 Homogeneous mixture Heterogeneous mixture A homogeneous mixture (also known as solution) has a uniform composition throughout. A heterogeneous mixture has a non-uniform composition of the components. There exist no boundary between the various components. It exists as one phase. The components exist in the solution as distinct parts (phases). A homogeneous mixture exists in all three states. eg. Gas $\rightarrow$ AirLiquid $\rightarrow$ Water + alcoholSolid $\rightarrow$ Alloys A heterogeneous mixture does not exist in all three states. There is no gaseous heterogeneous mixture.Other examples areSalt + SulphurOil + Water