Q30 of 38 Page 64

Draw a labelled diagram showing the process of fractional distillation.

1. Fractional distillation is used to separate a mixture of two or more miscible liquids in which which have a boiling point difference of less than 25K.

2. Fractional distillation is performed using a fractionating column.


3. Petroleum products are purified using fractional distillation and vapours codense at different temperatures.



Fig: Fractional Distillation


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(a) List any three characteristic of colloid.

(b) Name the two components of a colloid.


(c) Identify colloid from the following mixtures:


Muddy water, sugar in water, ink, blood, soda water, foam

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Enumerate any two differences between sample distillation and fractional distillation.

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Calculate the mass of potassium sulphate required to prepare its 10% solution in 100 g of water.

 31

Differentiate between physical and chemical change. Give one example of each. Give one example where both physical and chemical change is taking place.