Separation of Substances
Q1. State True/False
The property used in separating a mixture
of two solid by winnowing is difference in weight. True
The chemical used for loading is baking
A mixture of milk and water can be
separated by filtration. False
A mixture of powdered salt and sugar can be
separated by the process of winnowing. False
Separation of sugar from tea can be done
with filtration. False
Grain and husk can be separated with the
process of decantation. False
The method in which stalks are beaten to
free the grain seeds is called threshing. True
Sieving is used when the component of
mixture are of different sizes. True
The method of filtration is also used in
the process of preparing cottage cheese in homes. True
When no more salt can be dissolved in the given
amount of water at particular temperature, the solution is said to be
Centrifugation is used to separate cream
from curd. True
Hand picking can be used to separate cashew
nuts from mixture of almonds and cashew nuts. True
Q2. Fill in the blanks.
We can remove small stones from pulses
before cooking by handpicking.
The process of separating a liquid from
solid sediment is called decantation.
The method of separating seeds of paddy
from its stalks is called threshing.
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.
Salt is obtained from seawater by the process
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.
Hand picking method is used to separate stones from
Husk from wheat can be separated by decantation.
is used to remove impurities and bran from the flour.
The two liquids that do not mix with each
other can be separated by decantation.
Salt is obtained from sea water.
We see water drops under the plate that has
been used to cover a container containing milk that has just been boiled. This
is due to process of condensation.
Q3. Write any two methods used for separation of substances.
Hand picking and Threshing
Q4. How can we separate sand from water?
Sedimentation and Decantation
Q5. Which method can be used to separate soil from mixture of soil
Q6. Which method would you prefer to separate solid dissolved in
Q7. Which method farmers use to separate grains from bundles of
Q8. Which method do you prefer for tea leaves from prepared tea?
Q9 Filtration method is used to separate tea leaves from
prepared tea. Which other method can be used?
Q10. List various methods of separation of components from their
Ans. Some of the methods are: handpicking,
winnowing, threshing, sedimentation, decantation, filtration, evaporation and
Q11. The process of adding alum to water to fasten sedimentation
is called loading. Why has this name been given to the process?
It is because the suspended light particles become heavy on adding alum.