Class IX
Science (Chemistry)
 
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Heterogeneous mixture

A mixture that does not have uniform composition throughout is called heterogeneous.
For example: Mixture of chalk powder in water.

Suspension:
It is a type of heterogeneous mixture with following properties:

  • Particles can be seen with naked eye.
  • Particles can scatter light.
  • Suspension is not stable i.e., particles do not settle down when left undisturbed.
  • Components can be separated by filtration.
    For example: Sand mixed with water, Chalk powder in water.
Colloid:
It is a type heterogeneous mixture with following properties:

  • There are two components in a colloid: a dispersed phase and a dispersion medium.
  • Particle size is more than the 1 nm but particles cannot be seen with naked eye.
  • Particles can scatter light. This effect is called Tyndall effect.
  • Colloid is stable i.e., particles do not settle down when left undisturbed.
  • Components can be separated by centrifugation.
    Example: Clouds, milk, jelly, smoke, etc.