Write down the techniques used to separate the following mixtures:
a) Husk from wheat
b) Iron and sulphur
c) Camphor
d) Small pebbles from wheat
e) Sand and water
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Answers
Answer:
a) Husk is separated from heavier seeds of grain by winnowing. Difference in the size of particles in a mixture is utilised to separate them by the process of sieving and filtration. In a mixture of sand and water, the heavier sand particles settle down at the bottom and the water can be separated by decantation.
b) To seperate Iron and Sulphur from the mixture by physical means. Do this by wrapping the end of a small bar magnet in a paper tissue or cling film, and dipping it into a teaspoon-sized heap of the mixture on a watch glass. The iron will be attracted, but the sulfur remains on the watch glass.
c) Sublimation
Sublimation is a technique used to separate the components of a mixture containing a sublimable volatile solid and a non-sublimable impurity. Therefore, the mixture of camphor and sodium chloride can be separated by the process of sublimation.
d) A mixture of sand, pebbles, and stones can be separated by the process of sieving. Fine sand particles pass through the holes of the sieve, while bigger impurities such
e) In a mixture of sand and water, the heavier sand particles settle down at the bottom and the water can be separated by decantation. Filtration can be used to separate components of a mixture of an insoluble solid and a liquid.
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