METHODS OF SEPARATION We will discuss some simple methods of separating substances that are mixed together. You may come across some of these methods being used in day-to-day activities.
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Threshing You must have seen bundles of wheat or paddy stalks lying in fields after harvesting the crop. Stalks are dried in the sun before the grain is separated from them. Each stalk has many gra
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Winnowing Activity-3 Make a mixture of dry sand with sawdust or powdered dry leaves. Keep this mixture on a plate or a newspaper. Look at this mixture carefully. Can the two differen
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Sieving Sometimes, we may wish to prepare a dish with flour. We need to remove impurities and bran that may be present in it. What do we do? We use a sieve and pour the flour into it (Fig. 5.6).
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Sedimentation, Decantation, and Filtration Sedimentation and Decantation Sometimes, it may not be possible to separate components of a mixture by winnowing and handpicking. For example, there ma
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Evaporation Activity 6 Add two spoons of salt to water in another beaker and stir it well. Do you see any change in the colour of water? Can you see any salt in the beaker, after stir
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Use of more than one method of separation Evaporation and Condensation We have studied some methods for separation of substances from their mixtures. Often, one method is not sufficient to separ
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