Is Matter Around us Pure Notes

• A solution, in which more quantity of solute can be dissolved without raising its temperature, is called an unsaturated solution.

Or

• A solution which has less than the maximum amount of solute present in it at a given temperature is unsaturated.
• A solution, in which no more solute can be dissolved at that temperature, is called a saturated solution.
• A maximum of 32 grams of potassium nitrate can be dissolved in 100 grams of water at a temperature of 20^oC.
• So, a saturated solution of potassium nitrate at 20^oC contains 32 grams of potassium nitrate dissolved in 100 grams of water.

Physical Change:

• A change in physical state of matter under suitable conditions.
• A Change in which the shape, size, appearance or state, of a substance may alter, but its chemical composition remains same
• A physical change occurs when there is change in the interparticle spaces and also interparticle forces.

Characteristics associated with physical change

• Mixtures are formed by mixing of pure substances i.e. elements and compounds
• The constituents of a mixture do not react. Mixture shows the properties of its constituents.
• Many naturally occurring substances are associated with some impurities. These impurities are removed by suitable method or technique.

The method of separation of constituents from a mixture depends upon-

1.      The type of mixture (homogeneous or heterogeneous)

2.      The nature of the substances present in the mixture.

Separation of constituents from a heterogeneous mixture: