Methods of Separation in Everyday Life Class 6 (Curiosity)

(Page 178) What purpose does handpicking serve in the process of separation? (i) Filtration (ii) Sorting (iii) Evaporation (iv) Decantation (ii) Part is Correct Handpicking = Sorting
Sorting means arranging things into different groups

(Page 178) Which of the following substances are commonly separated using the churning method? (i) Oil from Water (ii) Sand from water (iii) Cream from milk (iv) Oxygen from air(iii) Part is Correct
Churning is only for separating fat (cream/butter) from milk or curd Item Method of Separation
(i) Oil from Water Decantation (ii) Sand from water Sedimentation and Decantation (iii) Cream from milk Churning (iv) Oxygen from air Distillation

(Page 179) Which factor is usually essential for the filtration? (i) Apparatus size (ii) Presence of air (iii) Pore size (iv) Temperature of the mixture(iii) Part is Correct
If we want to separate tea leaves from tea then we use tea strainer having large pores through which tea can pass but not tea leaves
Whereas If we want to separate mud from muddy water then we use filter paper which has smaller pores through which water can pass but mud cannot.

(Page 179) State with reason(s) whether the following statements are True [T] or False [F]. Also, correct the False statement(s). (i) Salt can be separated from salt solution by keeping it under the Sun. True [T] Reason:
Sun provides heat due to which water evaporates and salt is left behind.

(Page 179) State with reason(s) whether the following statements are True [T] or False [F]. Also, correct the False statement(s). (ii) Handpicking should be used only when the quantity of one component is less. True [T] Reason:
Handpicking takes a lot of time, so it is practical only when impurities are present in small amounts and are easily visible.

(Page 179) State with reason(s) whether the following statements are True [T] or False [F]. Also, correct the False statement(s). (iii) A mixture of puffed rice and rice grains can be separated by threshing. False [F] Correction: A mixture of puffed rice and rice grains can be separated by winnowing. Reason:
Puffed rice is lighter and is blown away by air, while rice grains fall down.

(Page 179) State with reason(s) whether the following statements are True [T] or False [F]. Also, correct the False statement(s). (iv) A mixture of mustard oil and lemon water can be separated by decantation. True [T] Reason:
Mustard Oil and lemon water
Are immiscible liquids (they do not mix with each other)
Mustard Oil is lighter than Lemon Water so it floats on top
We can separate them by pouring it slowly into some other container (Decantation)
Mustard Oil
Lemon Water

(Page 179) State with reason(s) whether the following statements are True [T] or False [F]. Also, correct the False statement(s). (v) Sieving is used to separate a mixture of rice flour and water. False (F) Correction: Sedimentation and Decantation/ Filtration is used to separate a mixture of rice flour and water.
Reason:
Rice flour is heavier than water
So it settles at bottom
(This is Sedimentation)
Water can be removed through decantation
Alternatively, we can use filtration to drain out water and get rice flour

(Page 179) Match the mixtures in Column I with their method of separation in Column II.(i) Gram flour mixed with black gram → (d) Sieving
Column I Column II
(i) Gram flour mixed with black gram
(ii) Chalk powder mixed with water
(a) Handpicking
(b) Magnetic separation
Decantation
Sieving
(e) Filtration
-
(ii) Chalk powder mixed with water → (e) Filtration
(iii) Corn mixed with potatoes → (a) Handpicking
(iv) Iron powder mixed with sawdust → (b) Magnetic separation
(v) Oil mixed with water → (c) Decantation

(Page 179) In what situations would you use decantation instead of filtration to separate solids from liquids?If Solid is soluble in Liquid
then we cannot use Filtration and Decantation
Example:- Salt in Water is Separated through Evaporation not Decantation or Filtration

(Page 179) Can you relate the presence of nasal hair to any separation process?The presence of nasal hair is related to filtration process.
Explanation:-
Nasal hair prevents dust and unwanted particles to enter in our body while breathing and helps to filter clean air into the lungs.

(Page 179) During the COVID-19 pandemic, all of us wore masks. Generally, what material are they made of? What is the role of these masks?Material:
Cotton or Non-woven fabric (polypropylene)
Role:
Masks act as filters so they prevent dust and germs from entering the body.

(Page 180) A mixture containing potatoes, salt and sawdust has been given to you. Outline a stepwise procedure for separating each component from this mixture.Handpicking - Pick out the potatoes by hand because Potatoes are large and easily visible.
Add water to the remaining mixture (salt + sawdust) - Stir well so that the Salt get dissolves in water and Sawdust floats on water.
Decantation - Remove the floating sawdust by decantation
Evaporation - Heat the salt solution. Water evaporates, leaving salt behind.

(Page 180) Read the following story titled ‘Intelligent Leela’ and tick the most appropriate options. Provide a suitable title of your choice for the paragraph. STORY Leela was working in the farm with her father when she realised that they left their drinking water at home. Before her father felt thirsty/hungry, she went to the nearby pond to fetch some water/grains. After obtaining some water in the container, she noticed that the water was muddy and fit/unfit for drinking. To purify the water, she kept it for some time and then she filtered/ churned the muddy water using a piece of paper/muslin cloth. Leela, then, cooled/boiled the water for about 10 minutes in a covered pan. After cooling/boiling, she filtered/churned it again and made it fit/unfit for drinking. She served this water to her father while having food, who blessed her and appreciated her efforts.Final Answer with Title Filter Specialist Leela Leela was working in the farm with her father when she realised that they left their drinking water at home. Before her father felt thirsty, she went to the nearby pond to fetch some water. After obtaining some water in the container, she noticed that the water was muddy and unfit for drinking. To purify the water, she kept it for some time and then she filtered the muddy water using a piece of muslin cloth. Leela, then, boiled the water for about 10 minutes in a covered pan. After boiling, she filtered it again and made it fit for drinking. She served this water to her father while having food, who blessed her and appreciated her efforts.