Chapter 5

Separation Of Substances

 

Introduction

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1. Why do we need to separate different components of a mixture? Give two examples.

Ans. Before we use a mixture, we must separate any undesirable or non-useful components that may be present. Even beneficial components of a mixture are sometimes separated if they are to be used independently. The items to be separated might be various sizes of particles or distinct materials. Examples of separation of substances are:

  • Separation of grains from stalks through threshing.
  • Separation of salt from water through evaporation.

2. What is winnowing? Where is it used?

Ans. Winnowing is the process of separating the contents of a mixture. Wind or blowing air separates the heavy and light parts of a mixture in this technique. Farmers apply this procedure to remove lightweight husk particles from heavy grain seeds.

3. How will you separate husk or dirt particles from a given sample of pulses before cooking?

Ans. We use the process of handpicking to separate husk or dirt particles from a sample of pulses before cooking. A small batch of pulses has less dirt or husk so that they can be easily removed by hand. The size difference between pulses and husks is also visible. It thus helps to separate them from a sample or batch mixture quickly.

4. What is sieving? Where is it used?

Ans. A sieve is an object with a net in the middle that helps in separating components of a mixture. Sieving is the separation of substances of a mixture bypassing the mixture through a sieve. A typical example of sieving is when construction workers pass impure sand through a sieve to remove pebbles and stones from pure sand. Sieving is used in flour mills to separate impurities or stones from grains before grinding them.

5. How will you separate sand and water from their mixture?

Ans. To separate the components of a sand and water mixture, we use the process of sedimentation and decantation. Sedimentation is the separation of substances when heavier components settle at the bottom of the container and water stays on top. Decantation is removing the separated water to obtain the settled heavy component.

6. Is it possible to separate sugar mixed with wheat flour? If yes, how will you do it?

Ans. Sugar and wheat particles vary in size. So, we can separate sugar mixed with wheat flour through sieving. The wheat particles will pass through the sieve, while sugar particles will remain on the sieve.

7. How would you obtain clear water from a sample of muddy water?

Ans. We can obtain clear water from a sample of muddy water through sedimentation and filtration. Here are the steps to follow:

  • First, we use the process of sedimentation. Let the sample of muddy water rest for a while. Keeping water undisturbed helps the heavy sand particles to settle at the bottom of the container. 
  • Next, we use the process of decantation. We remove the water from the container to separate it from the settled sand particles in this process.
  • Then, we pass the slightly muddy water through a filter paper to remove the finer sand particles left behind even after sedimentation.
  • Finally, we will get clean water after filtration.

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 ___________.

Ans.

(a) The method of separating paddy seeds from their stalks is called threshing.

(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 filtration.

(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 sedimentation and decantation.

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.

Ans. (a) A mixture of milk and water can be separated by filtration.

False

(b) The process of winnowing can separate a mixture of powdered salt and sugar.

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

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?

Ans. While preparing lemonade, we should first dissolve the sugar and then add ice to it. When the temperature of lemonade is higher, sugar gets easily dissolved. However, once we add ice to the lemonade, its temperature decreases, and the sugar becomes less soluble.

Ncert Solutions For Class 6 Science Chapter 5 Separation Of Substances are incredibly beneficial to solidify your knowledge and clarify all concepts. MSVgo's NCERT solutions will provide you with complete and precise answers to all of the problems in the Class 6 Science Separation Of Substances from the NCERT book. To score better in this subject, learners must study the most recent Science NCERT book from the start of each new academic year and complete the exercise problems regularly. Then, read MSVgo's specific NCERT answers for prompt and easy learning.

Class 6 chapter 5 Science includes the various techniques for the separation of substances. We discuss the processes to separate components from a mixture. We learn about handpicking, winnowing, sieving, sedimentation, decantation and filtration. The variation in particle size in a mixture is used to separate them through the sieving and filtering processes. The coarser sand particles sink to the base of the container, and the water may be removed by decantation. Filtration is performed to separate elements of an insoluble solid and liquid composition. The process of transforming a liquid into a gas is known as evaporation. We can use evaporation to separate a solid dissolved in a liquid. A saturated solution can be dissolved any further. By boiling the liquid, more of a component can be dissolved.

Students may use the NCERT Solutions for Class 6 Science Chapter 5 as a handy resource to help them understand these and other complicated concepts. Know about the class 6 Separation Of Substances concepts and textbook solutions through the MSVgo portal and app. Learn about Class 6 Chapter 5 Science and other chapters through video solutions to textbook questions on the MSVgo app. Use the interactive learning of the MSVgo portal to understand concepts and improve your performance quickly. So, join MSVgo today and download the MSVgo app to access solution videos and subject content.

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