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Q1 Why do we need to separate different components of a mixture? Give two examples. Ans: When two or more components mixes with each other, then it is known as mixture. When two or more components are there and we need one component from the mixture then we need to separate them. There are different techniques for separation like handpicking, winnowing, sieving and many more are there. For example:
- If we want to separate grains or pulses from the stones, then handpicking method will be used.
- If we want to separate husk or dust from the grains, then by winnowing method it is easy to separate.
Q2 What is winnowing? Where is it used? Ans: Winnowing is a separation technique which is used to separate the lighter components from the heavier components. This method is generally used to separate grains from the husk or dust. By this method, lighter particles like dust are just blew out with air.
Q3 How will you separate husk or dirt particles from a given sample of pulses before cooking. Ans: Here we use handpicking method to separate husk or dust particles from the given sample of pulses before cooking. Generally hand picking method is used to separate the large particles from the smaller ones. This method is used at home usually.
Q4 What is sieving? Where is it used? Ans: Sieving is a separation method or technique which is used to separate different size of particles. By sieving, fine particles are separated from the larger one. This method is generally used to separate fine particles of flour from the impurities and the larger particles. In this method, sieve has small holes through which fine particles of flour pass easily.
Q5 How will you separate sand and water from their mixture? Ans: Sand and water from their mixture can be separated by filtration, decantation or by sedimentation method.
- By using filtration method, the large particles of sand can be separated from mixture but this method is not so useful.
- By using decantation method, we separate out the pure layer of water from the insoluble sand which settle down at the bottom.
By using the sedimentation method, the sand particles settle down at the bottom when the solution left undisturbed. Then we can separate the sand from the water easily.
Q6 Is it possible to separate sugar mixed with wheat flour? If yes, how will you do it? Ans: Yes, it is possible to separate sugar mixed with flour of wheat. As we know sugar particles are larger in size as compared to wheat flour. Wheat flour have fine particles. So by using sieving method, we can do separation of sugar from the wheat flour. From the sieve the larger particles of sugar are separated while the fine particles of wheat flour pass through it easily.
Q7 How would you obtain clear water from a sample of muddy water? Ans: By using decantation or sedimentation method. We can separate clear water from a sample of muddy water. By decantation method, upper fine layer of pure water can be removed. By using sedimentation method, when we left the muddy water undisturbed for sometimes. Then the larger particles of mud settle down in the bottom and fine layer of pure water is obtained at the top of muddy water.
Q8 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 ___________. Ans: (a) Threshing
Threshing is the method of separation which is used to separate the grains from the stalk of the plant. In this method, stalks are beaten on the hard surface like drum or it can also be done by machines.
(b) Filtration
Filtration is the method of separation which is used to separate pure solution from the impure ones or from the larger particles.
(c) Evaporation
It is the process in which water evaporates from the sea water or we can say water converts into vapours.
(d) Decantation
Decantation is the method of separating two immiscible components from each other.
Q9 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. Ans: (a) False
No, both are miscible components and make a homogeneous mixture. So we cannot separate them by filtration.
(b) False
We cannot separate them by winnowing method because in powdered form they both will make a homogenous mixture.
(c) True
Yes, it is so because by filtration the larger particles of sugar can be separated whereas the solution of tea can pass through it easily.
(d) False
No, because decantation method is used for two immiscible components. This can be done by winnowing.
Q10 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? Ans: We should add ice to the lemonade after dissolving sugar because when we add ice before the sugar dissolution; the sugar will take time to dissolve in that cool solution. At the lower temperature, sugar dissolving capacity becomes weaker or lower.
Class 6 Science Chapter 5: Separation of Substances - NCERT Solutions
This page focuses on the complete NCERT solutions for Class 6 Science Chapter 5: Separation of Substances. This section provides detailed, easy-to-understand solutions for all the questions from this chapter. These Separation of Substances question answers will offer you valuable insights and explanations.
- In our daily life we use a different kind of materials.
- Different substances used by us, some are in pure form as some are in solution form or we can say in a mixture form.
- To separate the substances from other we use a number of separation techniques or methods,
- Handpicking method is used to separate large impurities from the required substance. For example: stones from pulses or grains.
- Threshing is used to separate grains from the stalks of the plants.
- Winnowing is a method of separation which is used for separating the lighter impurities from the heavier material. For example: dirt, dust from the grains.
- Sieving, sedimentation, decantation, filtration and evaporation are some other methods of separation.
- When no more amount of solute is added to the solution than the solution is said to be saturated.
Download pdf of NCERT Solutions for Class Science Chapter 5 Separation of Substances
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Exercise 1 ( Page No. : 45 )
Key Features of NCERT Class 6 Science Chapter 'Separation of Substances' question answers :
- All chapter question answers with detailed explanations.
- Simple language for easy comprehension.
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Popular Questions of Class 6 Science
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Draw (a) a leaf, (b) a taproot and (c) a flower, you have studied for Table 7.3.
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Name two foods each rich in:
(a) Fats
(b) Starch
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Tick (√) the statements that are correct.
(a) By eating rice alone, we can fulfill nutritional requirement of our body. ( )
(b) Deficiency diseases can be prevented by eating a balanced diet. ( )
(c) Balanced diet for the body should contain a variety of food items. ( )
(d) Meat alone is sufficient to provide all nutrients to the body. ( ) - Q:-
List all items known to you that float on water. Check and see if they will float on an oil or kerosene.
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Name the part of the plant which produces its food. Name this process.
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Why can a pace or a footstep not be used as a standard unit of length?
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Given below are the names of some objects and materials:
Water, basket ball, orange, sugar, globe, apple and earthen pitcher Group them as:
(a) Round shaped and other shapes
(b) Eatables and non eatables - Q:-
Name two items that are made from coconut fibre.
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Indicate true (T) and false (F) among the following sentences.
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Fill in the blanks.
(a) ______________ is caused by deficiency of Vitamin D.
(b) Deficiency of ______________ causes a disease known as beri-beri.
(c) Deficiency of Vitamin C causes a disease known as ______________.
(d) Night blindness is caused due to deficiency of ____________ in our food. - Q:-
A magnet was brought from different directions towards a toy boat that has been floating in water in a tub. Affect observed in each case is stated in Column I. Possible reasons for the observed affects are mentioned in Column II. Match the statements given in Column I with those in Column II.
Column I Column II
Boat gets attracted towards the magnet Boat is fitted with a magnet with north pole towards its head
Boat is not affected by the magnet Boat is fitted with a magnet with south pole towards its head
Boat moves towards the magnet if north Boat has a small magnet fixed along its length
pole of the magnet is brought near its
headBoat moves away from the magnet Boat is made of magnetic material when north pole is brought near its head
Boat floats without changing its direction Boat is made up non-magnetic material
- Q:-
Fill up the blanks in the following:
(a) The process of changing of water into its vapour is called _________________.
(b) The process of changing water vapour into water is called _________________.
(c) No rainfall for a year or more may lead to _________________ in that region.
(d) Excessive rains may cause _________________. - Q:-
How are cactus adapted to survive in a desert?
- 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 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 ___________.
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