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 NCERT SOLUTION CLASS 9 CHAPTER 2 (IS MATTER AROUND US PURE )  PAGE NO. 15

QUESTION NO. 1

What is meant by substance ?

ANSWER NO. 1

A pure substance consist of single type of particle. It is a pure single form of matter. It has definite properties and composition. Example - Iron.

QUESTION NO. 2

List the points of differences between homogeneous and heterogeneous mixtures.

ANSWER NO. 2

HOMOGENEOUS MIXTURE
  • Particles are uniformly distributed throughout the mixture.
  • It has a uniform composition.
  • Components cannot be separated easily.
  • Example - Solution of sugar and alloys.

HETEROGENEOUS MIXTURE

  • All the particles are completely mixed and can be distinguished with the eye or under a microscope.
  • It has a irregular composition.
  • Components can be separated easily.
  • Example - Mixture of sand and common salt, mixture of sand and water.


 

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