[Important Q's] Class 6 Science Chapter 3 Separation of Substances Extra Questions.
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Most Important Extra Questions for class 6th science chapter 3 - Separation of Substances.
# Class 6 Science Chapter 3 - Definitions :
Q. Define Pure Substances.
Ans. Many substances around us contain only one type of constituent particles. Elements and compounds are pure substances.
E.g. Iron, Copper, Salt, etc.
Q. Define Mixtures.
Ans. A mixture is a material made up of two or more different substances, which are mixed but are not combined chemically.
E.g. Air is a mixture of many gases like nitrogen, oxygen, carbon dioxide, dust particles, etc.
Q. Define Homogeneous Mixtures.
Ans. The mixtures in which the particles of the substances present cannot be seen are called homogeneous mixtures.
E.g. Mixture of sugar and water, air, etc.
Q. Define Heterogeneous Mixtures.
Ans. The mixtures in which particles of the substances present can be seen easily are called heterogeneous mixtures.
E.g. Mixture of water in oil, dust in air, etc.
Q. Define Handpicking.
Ans. Handpicking is a method of separation used to separate large sized impurities like pieces of dirt, stone, and husk from wheat, rice or pulses. This method is used when the quantity of impurities is usually not very large.
Q. Define Threshing.
Ans. Threshing is the process of beating stalks to separate the grains from the harvested crop. It is done manually by farmers, or by threshing machines.
Q. Define Winnowing.
Ans. Winnowing is the method of separation used to separate heavier and lighter components of a mixture by wind or by blowing air. Normally, this is used to separate husk from grains.
Q. Define Sieving.
Ans. Sieving is a method of separation in which the mixture is passed through a filter or a sieve. The larger particles do not pass through the filter, and hence collect on the sieve. The finer particles flow past the sieve and can be collected below.
E.g. Sieving of wheat flour, sieving of sand at construction sites.
Q. Define strainer.
Ans. Strainer is a kind of sieve which is used to separate a liquid from solid.
Q. Define Sedimentation.
Ans. When the heavier component in a mixture settles after water is added to it, the process is called sedimentation. This method is used in separating grains from dust and soil.
Q. Define Coagulation.
Ans. The process of adding a chemical substance to help the suspended solid particles in a liquid to form a sediment is called Coagulation.
E.g. Alum is added in dirt water to make its dirt particles heavier to settled down.
Q. Define Decantation.
Ans. Decantation is the process, done after sedimentation that involves removing the water, along with the impurities.
Q. Define Filtration.
Ans. Filtration is the process of passing the mixture through a filter to remove the solid particles from the fluid components of the mixture. For instance, if we pass muddy water through a fine filter, we can notice that the mud gets filtered and the water passes through.
Q. Define Evaporation.
Ans. The process of conversion of water into its vapour is called evaporation. The process of evaporation takes place continuously wherever water is present.
E.g. This process is used to get salt from sea water.
Q. Define Condensation.
Ans. The process of conversion of water vapour into its liquid form due to contact with a cooler surface is called condensation.
E.g. Formation of water droplets on a metallic lid, while boiling water.
Q. Define Churning.
Ans. It is also called Centrifugation of a homogenous mixture to separate its particles. It is the process of separation of the lighter particles of a suspended solid from a liquid.
E.g. To obtain butter from the curd or milk.
Q. Define Solution.
Ans. A solution is a homogeneous mixture composed of two or more substances.
In such a mixture, a solute is a substance dissolved in another substance, known as a solvent.
Q. Define Saturated solution.
Ans. A solution in which no more soluble substance can be dissolved at room temperature is called saturated solution.
E.g. A saturated solution of salt in water is that in which no more salt can be dissolved. This added salt will just sediment down to the bottom of the vessel.
Class 6 Science Chapter 3 Extra Questions.
Here at MSEducator.in you get Complete FREE Study Material for Class 6 Science Chapter 3 - Separation of Substances.
Which includes :-
# Class 6 Science Chapter 3 Explanation.
# Class 6 Science Chapter 3 Important Questions.
# Class 6 Science Chapter 3 - Very Short Answer Questions :
Q. Name the method used to separate cream from curd.
Ans. Centrifugation.
Q. How will you separate mango from a mixture of mango and apple?
Ans. By Handpicking.
Q. You are given a mixture of salt and sand. Can you separate them by picking?
Ans. No, we cannot separate them by picking.
Q. Name the method used to separate the pieces of stone from grain.
Ans. Handpicking.
Q. How can you separate grains from stalk?
Ans. By threshing.
Q. What types of material can we separate by using handpicking?
Ans. The materials having different size, shape and colour can be separated by handpicking.
Q. Name the other methods used to separate solid materials of different size.
Ans. Sieving.
Q. Name the process used to separate heavier and lighter components of a mixture.
Ans. Winnowing.
Q. Can Winnowing be used if both the components have same weight?
Ans. No, this method cannot be used.
Q. Name the method by which we get salt from ocean water.
Ans. Evaporation.
Q. Write opposite process of evaporation.
Ans. Condensation.
Class 6 Science Chapter 3 Extra Questions.
Here at MSEducator.in you get Complete FREE Study Material for Class 6 Science Chapter 3 - Separation of Substances.
Which includes :-
# Class 6 Science Chapter 3 Explanation.
# Class 6 Science Chapter 3 Important Questions.
# Class 6 Science Chapter 3 - Short Answer Questions :
Q. Why their is a need to separate substances?
Ans. Before we use any substance, we separate non-useful substances that may be mixed with it because –
(a) To remove the unwanted or harmful component.
(b) To obtain the useful component.
(c) To remove impurities for getting a pure sample.
Q. What are the various methods of separation of Mixtures?
Ans.
Methods of Separation are :
1. Handpicking
2. Threshing
3. Winnowing
4. Sedimentation
5. Decantation
6. Filtration
7. Evaporation
8. Condensation
Q. When is the handpicking method preferred to separation?
Ans. Handpicking can be used to separate the un-useful components of a mixture only when they are easily visible and are in smaller quantities.
Q. What is filtration? Explain how can muddy water be cleaned using this process?
Ans. A process where funnel fixed with filter paper is used, and dirty water passes through the funnel. Mud gets trapped in filter paper and clean water passes into the beaker.
Q. Where is decantation used? Give two examples.
Ans.
(a) 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.
(b) Oil and water also get separated by this method because oil floats up.
Q. What is saturated solution?
Ans. The solution in which no more solute can be dissolved is called saturated solution.
Q. Both Sarika and Mohan were asked to make salt solution. Sarika was given a teaspoonful of salt and half a glass of water, whereas Mohan was given twenty teaspoons full of salt and half a glass of water.
(a) How would they make salt solutions?
(b) Who would be able to prepare saturated solution?
Ans.
(a) They will mix salt with water to make salt solution.
(b) Mohan’s solution would be saturated because in Mohan’s case some salt would remain undissolved and settle at the bottom of the glass.
Q. How will you separate oil and water from their mixture?
Ans. 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.
Q. How is common salt obtained from sea water?
Ans. By evaporation, pits are made near the sea shores. The sea water is collected in the pits, soon with sunlight evaporation of water takes place leaving salt behind.
Q. How will you separate the mixtures of Grass, pebbles and sand?
Ans. Sieving to separate grass and stones, from sand. Later stones can be hand picked from grass.
Q. How will you separate the mixtures of water, sand, salt and iron fillings?
Ans. Magnet is used to pick iron nails, sand and salty water separates by sedimentation, salt is separated by evaporation, finally water received by condensation.
Q. Why Ice is added to lemonade after dissolving the sugar.
Ans. As solubility decreases with decreases in temperature
Q. Why water droplets appears under a lid of the kettle used for boiling water.
Ans. As condensation occurs on touching the cold lid
Q. Sheela, Saima and Ravi have to dissolve maximum amount of sugar in the same amount of milk so as to win in a game. Ravi took hot boiling milk while Saima took ice cold milk. Sheela managed to get milk at room temperature. Whom do you think would win the game and why?
Ans. Milk at higher temperature would dissolve more sugar so Ravi would win the game.
Q. Name and describe briefly a method which can be helpful in separating a mixture of husk from grains. What is the principle of this method?
Ans. Winnowing. This method is based on the principle that the lighter particles are carried away by the wind.
Q. You are provided with a mixture of salt, sand, oil and water. Write the steps involved for the separation of salt, sand and oil from the mixture by giving an activity along with the diagram.
Ans.
(a) Decantation – to separate oil
(b) Filtration – to separate sand
(c) Evaporation – to separate salt
Q. A mixture of iron nails, salt, oil and water is provided to you. Give stepwise methods to separate each component from this mixture?
Ans.
(a) Iron nails – hand picking/magnet.
(b) Oil – decantation.
(c) Salt, water – evaporation and condensation.
Class 6 Science Chapter 3 Extra Questions.
Here at MSEducator.in you get Complete FREE Study Material for Class 6 Science Chapter 3 - Separation of Substances.
Which includes :-
# Class 6 Science Chapter 3 Explanation.
# Class 6 Science Chapter 3 Important Questions.
# Class 6 Science Chapter 3 - Long Answer Questions :
Q. What is a Mixtures? Write its types and various methods of separation of components from their mixture.
Ans. A mixture is a material made up of two or more different substances, which are mixed but are not combined chemically.
E.g. Air is a mixture of many gases like nitrogen, oxygen, carbon dioxide, dust particles, etc.
Types of Mixtures are :
Homogeneous Mixtures : The mixtures in which the particles of the substances present cannot be seen are called homogeneous mixtures.
E.g. Mixture of sugar and water, air, etc.
Heterogeneous Mixtures : The mixtures in which particles of the substances present can be seen easily are called heterogeneous mixtures.
E.g. Mixture of water in oil, dust in air, etc.
Methods of Separation :
1. Handpicking
2. Threshing
3. Winnowing
4. Sedimentation
5. Decantation
6. Filtration
7. Evaporation
8. Condensation
Q. Explain the method that can be used for separating the following mixture:
(a) Sand and husk
(b) Wheat, sugar and stalk
(c) Water and petrol
(d) Rice and salt
(e) Sand and salt
Ans.
(a) Mixture of sand and husk can be separated by the method of winnowing.
(b) For separating stalk from the mixture we should use the winnowing method because stalk is lighter than other two components and get separated. Wheat and sugar can be separated by sieving because they are different in sizes.
(c) Water does not dissolve in petrol. So, it can be separated by the use of separating funnel.
(d) Rice and salt can be separated by sieving.
(e) Sand and salt is mixed with water, salt dissolves in water and sand can be separated from solution by sedimentation and decantation followed by filtration. After that using evaporation common salt can be separated.
Q. Paheli was feeling thirsty but there was only a pot of water at home which was muddy and unfit for drinking. How do you think Paheli would have made this water fit for drinking if the following materials were available to her.
Ans. She can follow the following steps:
1. Filtration using muslin cloth.
2. Swirl with alum and leave water undisturbed for some time.
3. The clear liquid above the impurities is another container (Decantation).
4. Boil for 10 minutes in covered pan with lid.
5. Cool, filter and now it is fit for drinking.
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