In this NCERT Science Solution for Class 6 Chapter 5 (Separation of Substances). All solution are provided in easy language.
In this chapter the student learn about Winnowing,Threshing, Filtration, Handpicking, Saturated solution, Churning, Decantation, Evaporation, Condensation, Sedimentation, Sieving, Solution, Threshing, Filtration, Handpicking, Saturated solution and Churning.
NCERT Class 6 Science Chapter 5 Solution
Question 1: Why do we need to separate different components of a mixture? Give two examples.
Answer 1: We separate harmful or non-useful substances that may be mixed with useful substance. Sometimes, we separate even useful substances if we need to use them separately.
Example: Seperation of butter from curd. Seperation of stone from grains.
Question 2: What is winnowing? Where is it used?
Answer 2: When unwanted substances are separated with the help of wind, this process is called winnowing. This process is used to separate heavier and lighter things from the mixture.
Question 3: How will you separate husk or dirt particles from a given sample of pulses before
cooking.
Answer 3: We separate the husk or dirt from pulses by handpicking or sedimentation process.
Question 4: What is sieving? Where is it used?
Answer 4: Separation of unwanted substances from the mixture by the sieve, is called sieving. This process is used to separate impurities from flour particles.
Question 5: How will you separate sand and water from their mixture?
Answer 5: By the process of sedimentation, we can separate sand and water from their mixture.
Question 6: Is it possible to separate sugar mixed with wheat flour? If yes, how will you do it?
Answer 6: Yes it is possible to separate sugar mixed with wheat flour. It can be separated by the process of sieving.
Question 7: How would you obtain clear water from a sample of muddy water?
Answer 7: We can find clear water from muddy water by the process of sedimentation and decantation. We can also find clear water from muddy water by filteration.
Question 8: 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 seawater 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 ___________.
Answer 8:
(a) The method of separating seeds of paddy from its stalks is called winnowing.
(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 filteration.
(c) Salt is obtained from seawater by the process of evaporation.
(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 decantation.
Question 9: True or false?
(a) A mixture of milk and water can be separated by filtration.
(b) A mixture of powdered salt and sugar can be separated by the process of winnowing.
(c) Separation of sugar from tea can be done with filtration.
(d) Grain and husk can be separated with the process of decantation.
Answer 9:
(a) A mixture of milk and water can be separated by filtration. (False)
(b) A mixture of powdered salt and sugar can be separated by the process of winnowing. (False)
(c) Separation of sugar from tea can be done with filtration. (False)
(d) Grain and husk can be separated with the process of decantation. (False)
Question 10: Lemonade is prepared by mixing lemon juice and sugar in water. You wish to add ice to cool it. Should you add ice to the lemonade before or after dissolving sugar? In which case would it be possible to dissolve more sugar?
Answer 10: We should add ice after dissolving sugar in the lemonade. If we dissolve sugar before adding ice then it is possible to dissolve more sugar.
(Solubility of the substance depends upon the temperature of the solvent/mixture)
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