NCERT Solutions for Class 6 Science Chapter 5 Separation Of Substances
Answer :
When two or more substance mix together we call it a mixture. Some time different component of mixture are not useful or may even harmful so we need to separate different components of a mixture.
Example: (a) Stone pieces from wheat, rice or pulses are picked out by hand.
(b) sand mixed in water are separated by sedimentation.
NCERT Solutions for Class 6 Science Chapter 5 Separation Of Substances
Answer :
We obtain clear water from a sample of muddy water by sedimentation or decantation method.
i) Allow muddy water to stand
ii) Mud gets settled down in the water
ii) Slowly pour water to another container
Q.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 ___________.
NCERT Solutions for Class 6 Science Chapter 5 Separation Of Substances
Answer :
(a) 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 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 decantation.
Q.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.
NCERT Solutions for Class 6 Science Chapter 5 Separation Of Substances
Answer :
a) False
b) False
c) False
d) False
Q.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?
NCERT Solutions for Class 6 Science Chapter 5 Separation Of Substances
Answer :
We should add ice after dissolving the sugar. it will be possible to add more sugar before adding ice.