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Decantation

Name the meth...

Question

Name the method of separation involved in each example given below.
(a) When it rains, the raindrops attach themselves to the dust in the air. This makes the dust particles heavy and brings them down to the ground. Because of this, the air becomes clearer.
(b) A mixture of water and mustard oil which are miscible are separated.
(c) Salt is separated from its mixture in water, so that the water is not lost.
(d) Rice is separated from its husk.
(e) A cook while washing rice found that the rice grains settled to the bottom of the vessel. He then drained out the top layer of water containing lighter dust particles. The rice was then transferred to a strainer to remove the excess water.
(f) Salt is separated from sea water.
(g) Sand is separated from gravel at a construction site.

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Solution

(a) Loading
(b) Separating funnel
(c) Distillation
(d) Winnowing
(e) Decantation
(f) Evaporation/heating
(g) Sieving

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Q. Select a suitable word from those given and write it in the space provided:
sieving, winnowing, loading, evaporation, decantation, filtration, condensation, distillation, sedimentation, sublimation
(a) After pounding, rice is separated from its husk by ______________ .
(b) A mixture of stones is allowed to fall through wire nets in order to separate them according to different sizes. This is a process of ______________ .
(c) When muddy water is kept overnight in a bucket, the clear water can be poured off from the top, next morning. This is a process of ________________ .
(d) Chilled milk is poured through a muslin cloth to remove the layer of cream. This is a process of _____________ .
(e) Salt is obtained from sea water by _____________ .
(f) Solid iodine can be separated from sand by ____________ .
(g) _____________ is used to separate immiscible liquids.
(h) The process of settling down of heavy solid particles at the bottom of a container coantaining a mixture of a liquid and an insoluble solid is _______________ .

Q. State whether the following statements are true or false.

(a) A mixture of oil and water can be separated by filtration.
(b) Water can be separated from salt by evaporation.
(c) A mixture of wheat grains and wheat flour can be separated by sieving.
(d) A mixture of iron filings and rice flour can be separated by a magnet.
(e) A mixture of wheat grains and rice flakes can be separated by winnowing.
(f) A mixture of tea leaves and milk can be separated by decantation.

Q. Fill up the blanks
(a) The method of separating seeds of paddy from its stalks is called ________.
(b) When milk, cooled after boiling, is poured onto a piece of cloth the cream (malai) is left behind on it. This process of separating cream from milk is an example of _________.
(c) Salt is obtained from sea water by the process of __________.
(d) Impurities settled at the bottom when muddy water was kept overnight in a bucket. The clear water was then poured off from the top. The process of separation used in this example is called _________.

Sonali was going to cook rice.She found husk particles in the rice.What should she do to separate those husk particles from rice before cooking rice? [1 MARK]

Q. To separate rice grains from dust, ________ can be performed.

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