Separation Of Substances - Chapter Wise CBSE Solved Question and Answer Based On NCERT
Points To Remember
Some of the methods to separate substances from their mixture are handpicking, winnowing, sieving, sedimentation, decantation and filtration.
Slightly large sized impurities can be separated by handpicking. Husk and stones can be separated by handpicking.
The process used to separate grains from stalks is threshing.
Winnowing is used to separate heavier and lighter components of a mixture by wind or by blowing air.
By sieving and filtration, particles of different size are separated.
When the heavier component of a mixture settles after water is added to it, the process is called sedimentation. When water is removed, the process is called decantation.
The process of conversion of water into its vapour is called evaporation whereas the process of conversation of water vapour into its liquid form is called condensation.
When no more solute (e.g. Salt) can be dissolved in the amount of solvent (e.g. Water) taken, the solution is said to be saturated solution.
By heating water more solute can be added to it before it gets saturated.
