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Class 6 NCERT Solutions for Science Chapter 5 – Separation of Substances Question answer Notes pdf in English |
Class 6 Science Chapter 5 Separation of Substances Question 1 :- Why do we need to separate different components of a mixture? Give two examples.
Class 6 Science Chapter 5 Separation of Substances Answer 1 :-
We need to separate different components of a mixture for the following reasons:
(1) To obtain useful components.
(2) To remove non-useful components.
(3) To separate more than one useful components from a mixture.
For example-
(i) Tea leaves are separated from the tea with a strainer while preparing tea.
(ii) Small stones present in rice are harmful. So, they are separated by the hand.
Class 6 Science Chapter 5 Separation of Substances Question 2 :- What is winnowing? Where is it used?
Class 6 Science Chapter 5 Separation of Substances Answer 2 :-
(i) Winnowing is a process of separating components of a mixture. It is used to separate heavier and lightercomponents of a mixture by wind or by blowing air.
(ii) This method is commonly used by farmers to separate lighter husk particles from heavier seeds of grain.
Class 6 Science Chapter 5 Separation of Substances Question 3 :- How will you separate husk or dirt particles from a given sample of pulses before cooking?
Class 6 Science Chapter 5 Separation of Substances Answer 3 :-
We can separate husk or dirt particles form a given sample of pulses by handpicking. This process normally used for separating slightly larger size impurities like pieces of dirt, stone, husk from pulses.Class 6 Science Chapter 5 Separation of Substances Question 4 :- What is sieving? Where is it used?
Class 6 Science Chapter 5 Separation of Substances Answer 4 :-
Sieving is a method by which fine particles are separated from bigger particles by using a sieve. Sieving is used when components of a mixture have different sizes. It is used in flour mill, construction sites and our homes.
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Class 6 Science Chapter 5 Separation of Substances Question 5 :- How will you separatesand and water from their mixture?
Class 6 Science Chapter 5 Separation of Substances Answer 5 :-
We will separatesand and water from their mixture by the process of sedimentation and decantation.
1) we leave the mixture for sometime in a glass. After sometime, sand which is heavier is settled down at the bottom (sedimentation)
2) After that, we will pour clearwater into another glass. This process is called as decantation.
Class 6 Science Chapter 5 Separation of Substances Question 6 :- Is it possible to separate sugar mixed with wheat flour? If yes, how will you do it?
Class 6 Science Chapter 5 Separation of Substances Answer 6 :-
Yes. It can be done. Sugar can be separated from wheat flour by sieving. Sieving allows the fine flour particles to pass through the holes of the sieve while the bigger sugar particles remain on the sieve.
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Class 6 Science Chapter 5 Separation of Substances Question 7 :- How would you obtain clear water from a sample of muddy water?
Class 6 Science Chapter 5 Separation of Substances Answer 7 :-
We will obtain clearwater from a sample of muddy water by the process of filtration. A filter paper is one such filter that has very fine pores in it. A filter paper folded in the form of a cone is fixed onto a funnel. The mixture is then poured on the filter paper. Solid particles in the mixture do not pass through it and remain on the filter and finally the clearwater is obtained.
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(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 in a bucket. The clearwater was then poured off from the top. The process of separation
used in this example is called____________.
Class 6 Science Chapter 5 Separation of Substances 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 in a bucket. The clearwater was then poured off from the top. The process of separation
used in this example is called____________.
Class 6 Science Chapter 5 Separation of Substances Answer 8 :-
(a) threshing,
(b) filtration,
(c) evaporation,
(d) decantation.
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(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.
(b) False. The winnowing process is used to separate heavier and lighter components by the wind or by blowing air. Thus, we cannot separate a mixture of powdered salt and sugar by this method.
(c) False. Sugar cannot be separated from tea by filtration because sugar is completely dissolved in tea.
(d) False. Grain and husk can be separated by the process of winnowing.
(ii) It will be possible to dissolve more sugar before adding ice. If we add ice before dissolving sugar, less amount of sugar will get dissolved.
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1. What is a strainer?
(b) filtration,
(c) evaporation,
(d) decantation.
Class 6 Science Chapter 5 Separation of Substances 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.
Class 6 Science Chapter 5 Separation of Substances Answer 9 :-
(a) False. Milk, Milk is completely dissolved in water so we cannot separate a mixture of milk and water by filtration.(b) False. The winnowing process is used to separate heavier and lighter components by the wind or by blowing air. Thus, we cannot separate a mixture of powdered salt and sugar by this method.
(c) False. Sugar cannot be separated from tea by filtration because sugar is completely dissolved in tea.
(d) False. Grain and husk can be separated by the process of winnowing.
Class 6 Science Chapter 5 Separation of Substances 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?
Class 6 Science Chapter 5 Separation of Substances Answer 10 :-
(i) We should add ice to the lemonade after dissolving sugar. Without ice, sugar dissolves easily in lemon juice, because solubility depends on the temperature.(ii) It will be possible to dissolve more sugar before adding ice. If we add ice before dissolving sugar, less amount of sugar will get dissolved.
Very Short types Questions and Answers
Answer: Strainer is a kind of sieve which is used to separate a liquid from solid.
2. Name the method used to separate cream from curd.
Answer: Centrifugation.
3. How will you separate mango from a mixture of mango and apple?
Answer: By picking
4. You are given a mixture of salt and sand. Can you separate them by picking?
Answer: No, we cannot separate them by picking.
5. Name the method used to separate the pieces of stone from grain.
Answer: Handpicking.
6. How can you separate grains from stalk?
Answer: We separate grains from stalk by threshing.
7. What types of material can we separate by using handpicking?
Answer: The materials having different size and colour can be separated by handpicking.
8. Name the other methods used to separate solid materials of different size.
Answer: Sieving.
9. Name the process used to separate heavier and lighter components of a mixture.
Answer: Winnowing.
10. Can the above stated method be used if both the components have the same weight?
Answer: No, this method cannot be used.
Short Questions:
1. What is mixture?
Answer: When two or more than two substances are mixed together in any ratio then it is called a mixture.
2. Write various methods of separation of components from their mixture.
Answer:
a. Handpicking
b. Threshing
d. Sedimentation
c. Winnowing
e. Decantation
f. Filtration
g. Evaporation
h. Condensation-
3. Define the term handpicking.
Answer: The process used to separate slightly larger particles from a mixture by hand is called handpicking. For example: Stone pieces can be separated from wheat or rice by handpicking.
4. What do you mean by threshing? Where is it used?
Answer: Threshing is a process in which we separate grain from stalks. This process is used by farmer to separate gram, wheat, rice, mustard seeds in his field.
5. Write three methods of separation.
Answer: Handpicking, threshing and winnowing..
6. How will you separate oil and water from their mixture?
Answer: Oil, being lighter than water, will float on it. Two distinct layers are formed and slowly oil is allowed to flow into another container and is separated from water. Separating funnel can also be used to separate the two.
7. What is evaporation?
Answer: The process of conversion of water into vapour is called evaporation. This process takes place continuously where water is present. Common sait from sea water is obtained using this method.
8. Define winnowing.
Answer: The process is used to separate components from a mixture in which one component is heavier or lighter than other is called winnowing. Winnowing is done with the help of wind or by blowing air.
Long Questions:
1. What is threshing?
Answer: Threshing is a process that is used to separate grain from stalks. In this process the stalks are beaten to free the grain seeds. Sometimes threshing is done with the help of bullocks. Machines are also used to thresh large quantities of grain.
2. Describe the method to obtain salt from sea water.
Answer: Sea water contains many salts mixed in it. One of them is common salt, when sea water is allowed to stand in shallow pits, water gets evaporated by sunlight and slowly turns into water vapour. In a few days, the water evaporates completely leaving behind the solid. salts. Common salt is then obtained from this mixture of salts by further purification.
3. What is decantation?
Answer: Decantation is a process, of separation of insoluble solids from liquid. The suspension of solid particles in liquid is allowed to stand for some time. The solid particles. then settle down at the bottom of the container and clean water goes up. Without disturbing the settled particles the clean water is transferred into other container.
4. Where is decantation used? Give two examples.
Answer: (i) Decantation is used to separate insoluble solids or liquid from liquid, Rain water is a mixture of mud and water. It is purified by decantation.
ii) Oil and water also get separated by this method because oil floats up.
5. How will you prepare cheese (paneer)?
Answer. For making paneer, a few drops of lemon juice sire added to milk as it boils. This gives a mixture of particles of solid paneer and liquid. The paneer is then separated by filtering the mixture through a fine cloth or strainer.
6. Explain the method that can be used for separating the following mixture:
Answer:
Answer:
(i) Mixture of sand and husk: Sand and husk can be separated by the method of winnowing.
(ii) Mixture of wheat, sugar and stalk: For separating stalk from the mixture we should follow the winnowing method because milk is lighter than other two components and get separated. Wheat and sugar can be separated by sieving because they are in different sizes.
(iii) Mixture of water and petrol: Water does not dissolve in petrol. So, it can be separated by the use of separating funnel.
(iv) Mixture of rice and salt: Rice and salt can be separated by sieving.
(v) Mixture of sand and salt: Sand and salt is mixed with water, salt dissolves in water and sand can be separated solution by sedimentation and decantation followed by filtration. After that using evaporation common salt is separated.
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Notes:- Latest NCERT Solutions 2024: Class 6 science chapter 3 Separation of Substances Notes in English
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