Separation of Substances Class 6 Science Chapter 5 Exercise

Class 6 Science Chapter 5 Separation of Substances Ncert Solutions are provided here. NCERT Intext and End Exercise of Class 6 Science Chapter 5 Separation of Substances.

Class 6 Science Chapter 5 : Separation of Substances

Separation of Substances is the fifth chapter of NCERT Text book of Class 6 Science. The end exercise and intext questions are comprised of the topics – Separation, Methods of Separation, Handpicking, Threshing, Winnowing, Sedimentation, Filtration, Condensation, sedimentation etc.

Chapter 05 : Separation of Substances ( Ncert Solutions)

SubjectScience
Class 6th – ( Class VI )
Chapter Chapter 5 : Separation of Substances
Study MaterialNCERT intext and End Exercise Solutions
Total Questions 10 Questions
Text BookNCERT Text Book

NCERT Solutions Class 6 Science Chapter 5 : Separation of Substances

Ques. 1 : Why do we need to separate different components of a mixture? Give two examples.
Ans.
We need to separate different components of a mixture to remove harmful and non useful substance from the mixture.

We also separate difference components to use them separately. Examples : Separating stones from wheat, Churning milk to obtain butter.

Ques. 2 : What is winnowing? Where is it used?
Ans.
Winnowing is a process used to separated heavier and lighter components of a mixture by wind or by blowing air. This process is used by farmers to separate lighter husk particles from heavier seeds of grains. Example : Separating husk from grains.

Ques. 3 : How will you separate husk or dirt particles from a given sample of pulses before cooking.
Ans.
Husk or dirt particles can be removed from a given sample of pulses by handpicking method.

Ques. 4 : What is sieving? Where is it used?
Ans.
Sieving is the process of filtering components of a mixture of different sizes . Sieving allows the fine particle of a mixture to pass through holes off the sieve , while he bigger impurities remain on the sieve.

The Sieving method is used in the flour mills to separate broken particles of the grain from flour.

It is also used at construction sites to separate the smaller stones from sand and cement. Pebbles and stones are also removed from sand by sieving.

Ques. 5 : How will you separate sand and water from their mixture ?
Ans.
We can remove separate sand and water from the mixture by following steps –

  • Allow the mixture to stand in a glass
  • After some time sand will settle at the bottom
  • Clear water forms at the upper layer .
  • Gently pour this water in another glass.

Ques. 6 : Is it possible to separate sugar mixed with wheat flour? If yes, how will you do it?
Ans.
As sugar is in crystal form and wheat flour is in the powder form. It is possible to separate them . We can use the sieving method to separate the sugar from wheat flour.

Ques. 7 : How would you obtain clear water from a sample of muddy water?
Ans.
To separate the water from a sample of muddy water follow these steps –

  • Allow the muddy water to stand.
  • Mud gets settled down in the water . This process is called as sedimentation.
  • Slowly pour the water to another container. This process is called decantation
  • Now filter using a filter paper to get clear water. This process is known as filtration.

Ques. 8 : Fill up the blanks
(a) The method of separating seeds of paddy from its stalks is called ____________________.

Ans. Threshing.
The method of separating seeds of paddy from its 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 ______________.
Ans. Filtration
The method of separating seeds of paddy from its stalks is called Filtration

(c) Salt is obtained from seawater by the process of ______________.
Ans. Evaporation.
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 _________________.
Ans.
Decantation

Ques. 9 : True or false?
(a) A mixture of milk and water can be separated by filtration.

Ans. False

(b) A mixture of powdered salt and sugar can be separated by the process of winnowing.
Ans. False

(c) Separation of sugar from tea can be done with filtration.
Ans. False

(d) Grain and husk can be separated with the process of decantation
Ans.
False

Ques. 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.
We should add ice to the lemonade after dissolving sugar. It will be possible to dissolve more sugar before adding ice.