Use of more than one method
of separation
We have studied some methods for
separation of substances from their
mixtures, Orten, one method is not
sufficient to separate the different
substances present in a mixture in such
a situation, we need to use more than
one of these methods
Answers
In the day to day life, there are times when one needs to separate a useful substance from a mixture. This is done by using various methods of separation of substance.
Mixture: A substance which is composed of two or more substances; in which each component retains its unique property; is called mixture. Air is a mixture of gases. Water which we drink is a mixture of pure water and many other substances.
Pure Substance: A substance is called pure when each particle of the substance has the same unique property. For example; distilled water is pure water as each drop of it contains nothing but water.
Need for separation of substances: Taking out useful substances from a mixture is usually the main reason for separation of substances. Sometimes, we also need to separate substances when we need to use different components in different ways.
Separating solid from a mixture of solids
Handpicking: It is the simplest method of separation of substances. This method is used only when unwanted material is in small quantity. Moreover, shape, size, or colour of the unwanted material is different from that of the useful materials. For example; pebbles, broken grains and insects are separated from rice, wheat and pulses; by handpicking.
Threshing: Threshing is used for separating seeds from the harvested stalks.
Manual Threshing: When the quantity is small, threshing is done manually. Small bundles of the harvested stalks are thrashed on a hard surface. This helps in separating the grains.
Threshing by Animals: For larger quantities, threshing is done in the traditional way; by using animals. For this, stalks are spread around a pole. Several bullocks are tied to the pole and are made to walk over the harvested stalks. Trampling by hooves of the animals helps in separating grains.
Threshing Machine: Now-a-days, threshing machines are used for the purpose. It can be powered by either a diesel engine or an electric motor. It helps in saving time and labour.
Sieving: When the size of particle it too small to be picked by hand or when the quantity is too large, sieving is used for separating substances. A sieve; having holes of proper size is used. The bigger particles are retained by the sieve whereas the smaller ones pass through it. For example; this method is used for separating bran from flour, sand from gravel, pearls of different sizes, etc.
Winnowing:The process of separation of lighter particles from heavier particles; with the help of wind; is called winnowing. This method is used for separating grains from husk. Farmers drop the mixture of wheat and husk from a height. The husk is carried by the wind and form a heap at a small distance away. The wheat grains being heavier fall vertically to form a separate heap.
Combine Harvester: Modern farming involves use of a machine; called combine harvester. This machine harvests, threshes and winnows in a single operation. Combine harvesters are used in developed countries; like the USA. In India, such machines can be seen in the farms of Punjab.
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Answer:
here is your answer
Explanation:
Can you please tell on which thing can I give you the separation technique
Don't worry I help you
- To separate liquid substance like cream from milk we can use centrifugation method..
- To separate solid substance mostly we use filtration method like separate water and stones
So also there are many things to separate and many techniques.
But I hope this will help you..
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