SEPARATION OF SUBSTANCES
Assignment No. 2
Q.1 Multiple choice questions (Choose the correct option)
(A) Most of the substances we see around us are
(a) Pure Elements (b) Pure Compounds (c) Mixtures
(B) A solution of salt in water is a?
(a) Compound (b) Homogeneous Mixture (c) Heterogeneous Mixture
(d) Element
(C) The property used in separating a mixture of two solids by winnowing is
(a) difference in color (b) difference in size
(c) difference in weight (d) Attraction by magnet
(D) Which method is used to obtain pure liquid from a solution?
(a) Distillation (b) Condensation
(c) Filtration (d) Loading
(E) Which of the following can dissolve in water?
(a) Only Solids (b) Only solids and liquids
(c) Solids, liquids & gases (d) only liquids
Q.2 What is separation?
Q.3 Why the separation of substances is necessary?
Q.4 What is the basis of separation of components of mixture?
Q.5 When do we use hand picking as the method of separation?
Q.6 What is threshing? How is it done?
Q.7 Define winnowing? What is the principle of using winnowing as method of separation?
Q.8 Where do we find sieving as the method of separation?
Q.9 You are given a mixture of sand, salt and iron filling. Suggest some methods for separating all the components of this mixture?
Q.10 Define filtration? Give 3 examples where filtration method is used.
Q.11 What is evaporation? Where do we use this method at home?
Q.12 What method is used to separate salt from sea water and how?
Q.13 In which cases handpicking is enough as a method of separation?
Q.14 One method of separation is not enough. Comment.
Q.15 Differentiate between a pure substance and a mixture.
Q.16 Is the separation of two immiscible liquids using separating funnel same as decantation?
Q.17 What do you use to remove discarded tea leaves from tea?
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