Chapter 5 Separation of Substances

  • In our daily life we use a different kind of materials.
  • Different substances used by us, some are in pure form as some are in solution form or we can say in a mixture form.
  • To separate the substances from other we use a number of separation techniques or methods,
  • Handpicking method is used to separate large impurities from the required substance. For example: stones from pulses or grains.
  • Threshing is used to separate grains from the stalks of the plants.
  • Winnowing is a method of separation which is used for separating the lighter impurities from the heavier material. For example: dirt, dust from the grains.
  • Sieving, sedimentation, decantation, filtration and evaporation are some other methods of separation.
  • When no more amount of solute is added to the solution than the solution is said to be saturated.

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Exercise 1 ( Page No. : 45 )