Chapter 5: Separation of Substances

Sheela, Saima and Ravi have to dissolve the maximum amount of sugar in the same amount of milk so as to win in a game. Ravi took hot boiling milk while Saima took ice-cold milk. Sheela managed to get milk at room temperature. Who do you think would win the game and why? 

Fill in the blanks with appropriate words: 

(i) Small pieces of stone can be removed from rice by __________. 

(ii) ___________ are obtained from stalks by threshing. 

(iii) Husk from wheat flour is generally removed by __________. 

(iv) The process of settling of heavier particles is called __________. 

(v) Filtration is helpful in separating an insoluble __________ from a __________. 

State whether the following statements are true or false. 

(a) A mixture of oil and water can be separated by filtration. 

(b) Water can be separated from salt by evaporation. 

(c) A mixture of wheat grains and wheat flour can be separated by sieving. 

(d) A mixture of iron filings and rice flour can be separated by magnet.