Chapter - 5 : Separation of Substances
Question 1. Fill in the blanks.
1.
A mixture of iron
fillings and sand can be separated by using a _________.
2.
Particles that settle
down in a mixture after some time form the _________.
3.
Transfer of clear
liquid to another container after the process of sedimentation is called
________.
4.
In a mixture of
sawdust and water, ________ is retained by the filter paper.
5.
A fine _______ cloth
can be used a filter.
6.
Oil is _______ than
water.
7.
_________ liquids are
separated by distillation.
8.
A mixture of oil and
water is an example of ________ liquids.
Question
2. Sedimentation and
decantation is a method used for separating heavier insoluble
substances from water. Find out where this method is used in day-to-day lives.
For examples, you can enquire your mother if she uses this method while
cooking. List at least five uses of the method.
Question
3. Differentiate
between homogeneous and heterogeneous mixtures. Give example of each.
Question
4. Which method of
separation should be used to separate the following mixtures?
1.
Grain and husk
____________________________
2.
Grain from
stalks
____________________________
3.
Assorted
candies ____________
4.
Grain and chaff
5.
Bran and wheat flour
6.
Sand and gravel
7.
Sand and powered
leaves
Question
5. Answer the
following in (25-35 words)
(a) A Mixture
(b) Components of a
mixture with the help of an example.
(c) Melting
point
(d) Boiling
point
Question
6. What happens
when the polluted water is allowed to stand for 10 minutes?
Question
7. How is common
salt obtained from sea water?
Question
8. Describe a
simple experiment to show the distillation of water.
Question
9. A saturated solution of
sugar in water is prepared. The temperature of water is lowered by 5°C.
Will the solution continue to be saturated? Give Reasons.
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