A material that is composed of only one type of particles is called pure substance. All the constituent particles of a pure substance have same chemical nature.
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Homogeneous mixtures |
Heterogeneous mixtures |
| Homogeneous mixtures have uniform composition. | Heterogeneous mixtures have non uniform composition. |
| It has no visible boundaries of separation between its constituents. | It has visible boundaries of separation between its constituents. |
A homogeneous mixture is a mixture having a uniform composition throughout the mixture. For example, mixtures of salt in water, sugar in water, copper sulphate in water, iodine in alcohol, alloy, and air have uniform compositions throughout the mixtures.
On the other hand, a heterogeneous mixture is a mixture having a non-uniform composition throughout the mixture. For example, composition of mixtures of sodium chloride and iron fillings, salt and sulphur, oil and water, chalk powder in water, wheat flour in water, milk and water are not uniform throughout the mixtures.
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Sol |
Solution |
Suspension |
| They are heterogeneous in nature. | They are homogeneous in nature. | They are heterogeneous in nature. |
| They scatter a beam of light and hence show Tyndall effect. | They do not scatter a beam of light and hence do not show Tyndall effect | They scatter a beam of light and hence show Tyndall effect. |
| They are quite stable. | Examples of solution are: salt in water, sugar in water. | Examples of suspension are: sand in water, dusty air |
