Is Matter Around us Pure?

Mixtures are of two types:

• Homogeneous mixture
  • Those mixtures in which the substances are completely mixed together and are indistinguishable from one another are called homogeneous mixtures.
  • They possess the same properties and combination throughout their mass.
  • All the homogeneous mixtures are called solutions.
  • Some examples of homogeneous mixtures are petrol and oil mixture, Salt solution, Copper sulphate solution.

• Heterogeneous Mixtures
  • Those mixtures in which the substances remain separate and one substance is spread through the other substance as small particles, droplets or bubbles are called Heterogeneous mixtures.
  • They possess different properties and compositions in various parts.
  • In other words, the properties are not uniform throughout the mixture.
  • The suspensions of solids in liquids are also heterogeneous mixtures.
  • Examples are air, oil, water, etc.

Difference between Homogeneous and Heterogeneous Mixture:

Characteristics of Mixtures:

Mixtures are not made up of fixed proportions. The various characteristics of mixtures are:

• During the formation of a mixture, there is no change in the energy.
• All the states of matter (solid, liquid, gases) can combine to form mixtures.
• The constituents of the mixture can be separated by physical methods.
• Boiling point and the melting point of the mixture depends upon the characteristic of the constituents.
• No chemical force acts between the two or more substances that are mixed, but they still exist together.
• They can either be heterogeneous or homogeneous in nature.
• The proportions of the substances vary indefinitely.
• The properties of the mixture depend upon the individual components.