1. Choose the correct option:
(a) The process used in the manufacture of salt from sea water is
(i) condensation (ii) filtration (iii) evaporation (iv) sedimentation
(b) Choose the mixtures that can be separated by using a sieve.
(i) sand and gravel (ii) husk and grain (iii) salt and sand (iv) rice and
small pieces of stones
(c) A mixture of sand and iron fillings can be separated by
(i) magnetic separation (ii) handpicking (iii) winnowing (iv) sieving
(d) Pick the method which is not used for separating mixtures
(i) sieving (ii) winnowing (iii) weaving (iv) handpicking
(e) Sometimes water drops on surface of leaves are seen in the
morning due to
(i) condensation of water drops (ii) evaporation of water vapours
(ii) photosynthesis (iv) respiration
(f) Sieving is based on the difference in the
(i) weight of solid components (ii) size of solid components
(iii) weight of liquid components (iv) colour solid components
(g) The property used in separating a mixture of two solids by
winnowing is
(i) difference in colour (ii) difference in size
(iii) difference in weight (iv) attraction of magnet
(h) Separation of kerosene oil and water is done by
(i) decantation (ii) filtration
(iii) condensation (iv) churning
2. Name the different methods of separation of solid from a liquid by
looking at the given pictures.
Natural Sciences Grade 7 Decantation - Wikipedia
(b)
Methods of Separation II (Learn) : Chemistry : Class 6 : Amrita ... Butter Churn Stock Pictures, Royalty-free Photos & Images
(c) (d)
3.
What You Need to Know to Become a Carpenter | Dumpsters.com
A carpenter was working in Rahul’s house. Accidently some
saw dust fell into the bucket of water kept near the
carpenter. Now Rahul wants to get back the clean water.
Can you help him?
4.In a kitchen , sugar was stored in glass container.
Accidently the container fell down and the broken pieces of
glass get mixed with the sugar. How can you separate
them?
5. Give two situations where it is necessary to separate a
mixture into its constituents.
Answers
Explanation:
(i) Mixture of sand and husk: Sand and husk can be separated by the method of winnowing.
(ii) Mixture of wheat, sugar and silk: For separating silk from the mixture we should follow the winnowing method because silk is lighter than other two components and get separated. Wheat and sugar can be separated by sieving because they are in different sizes.
(iii) Mixture of water and petrol: Water does not dissolve in petrol. So, it can be separated by the use of separating funnel.
(iv) Mixture of rice and salt: Rice and salt can be separated by sieving.
(v) Mixture of sand and salt: Sand and salt is mixed with water, salt dissolves in water and sand can be separated solution by sedimentation and decantation followed by filtration. After that using evaporation common salt is separated.
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