1. What process is used to separate a mixture of liquids?

a) Filtration
b) Fractional distillation
c) Simple distillation
d) Chromatography

2. Which method of distillation is used to separate salt from a salt solution?

a) Fractional distillation
b) Simple distillation

3. What is the purpose of anti-bumping granules in distillation?

a) To increase the boiling point of the liquids
b) To prevent violent boiling and splashing
c) To increase the rate of evaporation of the liquids
d) To help the liquids dissolve

4. What is the function of a fractionating column?

a) To separate liquids with different densities
b) To increase the rate of evaporation of the liquids
c) To hold the thermometer
d) To separate liquids which have boiling points close together

5. In a Liebig condenser cold is used to cool the tube which cools and condenses any vapours which come into contact with it.

6. In a fractionating column vapours rise and condense at different heights in the column because different liquids have different points.

7. Which of the following is not a step in distillation?

a) Filtration
b) Evaporation
c) Condensation
d) Heating

8. In a fractional distillation experiment how will you know when the vapour with the lowest boiling point has finished evaporating and the next vapour is starting to condense?

a) The boiling in the round bottomed flask will become more violent
b) There may be a colour change
c) The thermometer reading will increase
d) The thermometer reading will decrease

9. In a distillation procedure the Liebig condenser is used to any vapours which enter it and turn them back into .

10. A student was attempting to separate a mixture of two miscible liquids with very similar boiling points using fractional distillation. Upon analysis of the collected fractions, it is found that the separation was incomplete. Which of the following modifications to the experimental set-up would most effectively improve the separation of the liquids?

a) Decrease the amount of heat supplied to the mixture of liquids
b) Add more anti-bumping granules
c) Reduce the water flow through the Liebig condenser
d) Increase the height and surface area available inside the fractionating column