Name the method used to separate the following mixtures?
i. Wheat flour and sugar
ii. Kerosene and petrol
iii. Husk from rice
iv. Copper sulphate from water
v. Cornflakes from milk
Answers
Explanation:
(i) Mixture of sand and husk: Sand and husk can be separated by the method of winnowing.
(ii) Mixture of wheat, sugar and silk: For separating silk from the mixture we should follow the winnowing method because silk is lighter than other two components and get separated. Wheat and sugar can be separated by sieving because they are in different sizes.
(iii) Mixture of water and petrol: Water does not dissolve in petrol. So, it can be separated by the use of separating funnel.
(iv) Mixture of rice and salt: Rice and salt can be separated by sieving.
(v) Mixture of sand and salt: Sand and salt is mixed with water, salt dissolves in water and sand can be separated solution by sedimentation and decantation followed by filtration. After that using evaporation common salt is separated.
Answer:
1) Sugar can be separated from wheat flour by sieving. Due to difference in the size of particles, sugar will stay on sieve and wheat flour will pass through it.
2) Simple distillation can be used when the temperature difference between the boiling points of two miscible liquid is at least 25oC. The temperature difference between the boiling points of kerosene and petrol is 25oC. Hence, this mixture can be separated using simple distillation.
3) husk can be separated by winnowing. This method of separation is used to separate the lighter particles from the heavier particle of a mixture by blowing wind.
4)Evaporation is used to separate a soluble solid from a liquid. For example, copper sulfate is soluble in water – its crystals dissolve in water to form copper sulfate solution. During evaporation, the water evaporates away leaving solid copper sulfate crystals behind.
5) Filtration method is used for separating insoluble substance from a liquid. But mixture of two liquids such as oil in water cannot be separated by this method. ... So, cornflakes in milk can be separated by filtration.
Explanation:
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