Class 6 Science Chapter 5: Separation of Substances Worksheet
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Question 1 VERY SHORT ANSWER TYPE QUESTION.
(i)List few methods of separations
(ii)which method will you prefer to separate a solid dissolved in liquid?
(iii)Name the process used to separate butter from curd.
(iv)Which method is used to obtain a pure liquid from a solution?
(v)What property is used to separate water from bigger soil particles?
(vi)What is a saturated solution?
(vii) Name the process by which water is separated from rice and pulses after washing them.
Answer
i: Handpicking, Threshing, Winnowing, Sieving.
ii: evaporation
iii: churning
iv: Distillation
v: The difference in weights of substances.
vi: A solution in which no more substance can be dissolved at a given temperature, is called a saturated solution.
Question 2 SHORT ANSWER TYPE QUESTION.
(i)What is loading? why is the process named so?
(ii)Mention few essential physical properties of pure substance.
(iii)How can you convert a saturated solution of sugar to unsaturated solution, without adding water?
(iv)From the given list Identify the pure and impure substances.
Air Oxygen Soil Sugar Tea Sea water
Salad Oil and water hydrogen Sea Sand
(v)What is known to be the universal solvent & why?
(vi)List the properties of mixture.
(vii)How can you say that sea water is a Heterogeneous mixture?
(viii)Why does visibility increase after rain?
Answer
i: the process of fastening sedimentation by adding alum to the water is called Loading.
It is called so because the suspended light particles become heavy on adding alum.
ii: A pure substance will have a fixed boiling point, a fixed melting point
iii: We can convert it into unsaturated solution by heating the solution.
iv: impure- Air, soil, tea, sea water , salad, oil & water, sea sand
Pure: oxygen , sugar, hydrogen
v: Water is called the "universal solvent" because it dissolves more substances than any other liquid. This is important to every living thing on earth.
vi:
A mixture may be solid liquid or gas.
Mixture may be homogeneous or heterogeneous in nature
The various substances which are present in a mixture are called its components
vii: The salts , minerals, and other impurities mixed in sea water are not in equal proportion through out the entire quantity of the sea water.
viii: After rain the objects at a distance are seen more clearly because the fine dust particles that were present in air settle down due to loading by rain drops.
Question 3 SHORT ANSWER TYPE QUESTION/HOTS [2-3 marks]
(i)Describe the process of sieving?
(ii)Vinegar is a solution of acetic acid in water. What kind of mixture is vinegar?
(iii)Three glasses are taken as A, B and C filled with water. To glass A 2 teaspoon of sugar is added, in glass B 4 teaspoon of sugar is added and to glass C 5 teaspoon of sugar is added. Which glass is most saturated? Why?
(iv) Complete the following table:
(v)Rakhi accidently spill cooking oil on a milk container. Will she be able to separate the both?
(vi)What happens when steam comes in contact with the metal plate cooled with ice?
(vii) What is hand-picking method of separation? When is it used?
Answer
i: sieving is a process by which a mixture with components of different sizes are separated. Sieving allows the fine flour particles to pass through the holes of the sieve while the bigger impurities remain on the sieve.
ii: it is a homogeneous mixture of liquid and liquid.
iii: Glass C will be most saturated as more amount of sugar is added to it.
iv:
Various salt, water
Sugar and salt
Blood cells, water, inorganic salts
v: yes, milk and oil are immiscible liquids and hence can be separated by the process of decantation.
vi: When steam comes in contact with the metal plate cooled with ice, it condenses and forms liquid water.
vii:Handpicking is a separation technique used to remove the unwanted impurities from the mixture by hand. It involves simply picking out substances by hand and separating them form others.Handpicking method can be used when items differ on the basis of color, shape and weight
LONG /SKILL BASED /DIAGRAM-BASED ANSWER TYPE QUESTION.
Question 4
Study the picture given below and answer the questions that follows.
Name the process that you can see in the picture.
Define the process. why is it done?
Write down what is labelled a, b, c, d
Answer
i.Winnowing
ii.The process of separating heavier and lighter components of a mixture by wind or by blowing air is called winnowing.
It is commonly done by farmers to separate lighter husk particles from heavier seeds of grain. The farmer allows the mixture of grain and the husk to fall from a height.
iii.
a- direction of the wind
b- soop
c- husk
d- grain
Question 5
Complete the following table
Answer
Handpicking
Sedimentation
Evaporation/ heating
Decantation
Question 6
Explain how you make crystals of sugar?
Answer
prepare sugar solution in hot water. Allow the container to cool and filter the solution. Hang a crystal of sugar in this solution with the help of a thread and glass rod. Leave the solution uncovered and undisturbed for few days. It will be observed that crystal of sugar slowly begins to grow.
Question 7
Look at the picture given below and answer the questions that follows.
Name the all the processes shown in the figure.
Name at least two solutions which can be present in beaker labelled 1. What do you think might be the nature of the solution?
Name the substance present in beaker 2.
Answer
i.Evaporation/Distillation & Condensation.
ii.Salt solution. Sugar solution
The mixture will be a homogeneous mixture.
iii.Pure water.
Question 8
“separating a mixture of sugar crystals and wheat flour is impossible”. Do you agree with this statement? Justify.
Answer
No, I don’t agree with the above statement.
We can separate wheat flour from sugar crystals by the method of sieving. The holes in the sieve will allow fine particles of the wheat flour to pass through while the bigger crystals of sugar will remain on the sieve.
