IS MATTER AROUND US PURE part 4

Exercises (pg 28-30)
1. What separation techniques will you apply for the separation of the following:
(a) Sodium chloride from its solution in water: Evaporation
(b) Ammonium chloride from a mixture containing sodium cholride and ammonium chloride: Sublimation
(c) Small pieces of metal in the engine oil of a car: Filtration
(d) Different pigments from an extract of flower petals: Chromatography
(e) Butter from curd: Centrifugation
(f) Oil from water: Separating Funnel
(g) Tea leaves from tea: Filtration
(h) Iron pins from sand: Magnet
(i) Wheat grains from husk: Winnowing
(j) Fine mud particles suspended in water: Filtration

2. Write the steps you would use for making tea, use the words – solution, solvent, solute, dissolve, soluble, insoluble, filtrate and residue.
(i) Take about 20ml of tap water (solvent) in a beacker.
(ii) Boil the water in a pan.
(iii) Put some tea leaves in a tea pot.
(iv) Pour some boiling water into the pot. It will form a solution.
(v) Put sugar (solute) into a cup.
(vi) Stir the solution in the tea pot.
(vii) Using a strainer, pour the solution into the cup.
(viii) Add two tea-spoons of milk.
(ix) Remove the strainer and stir with a spoon.
(x) The tea is ready and the leaves (residue) will be left on the strainer while tea (filtrate) will pass through the solution.