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Exam Solutions

  1. Evaporate/boil off all the water

You will be left with a layer of residue (solid).

  1. Filtration

  2. Soil and water

  3. Funnel

  4. A – the funnel

  1. Diagram: see diagram

Equipment: Filter paper, funnel, beaker, retort stand.

Procedure: Pour the mixture through the funnel.

Water drips through

Result: Soil remains in the filter paper

    1. Sand

    2. Salt and water

  1. Distaillation

  2. Condenser

  3. Part B

  4. Evaporate the water and note that there is nothing left behind.

  5. Salt

  1. A: Round bottomed flask B: Thermometer C: Condenser

D: Cold water in E: Beaker F: Bunsen

  1. Distillation

  2. Cobalt chloride paper/ (anhydrous) copper sulphate

  3. Blue cobalt chloride paper turns to pink / white copper sulphate turns to blue

    1. Chromatography

    2. Water

    3. Colours appear (separation)

    4. There would be no separation

  1. Set up as shown, using chromatography (filter) paper

Put the ink spots on the paper above the water

The water rises up the paper, bringing the various inks with it.

  1. There is no separation for an ink composed of a single colour but separation does occur for an ink composed of a mix of coloured inks.

    1. Colours appear (separation)

    2. There would be no separation

  1. Because the ink dot would dissolve into the liquid/ ink would not rise up the paper/ ink soluble

  2. They were carried up by the liquid/ capillarity

  3. The brown ink was a mixture of inks/ made up of different colours

  1. D: mortar and pestle

  2. Beaker

  3. Bunsen burner

  4. Filtration

  5. Dirt particles are too big to pass through the pores, the dirt doesn’t dissolve

  6. Evaporation, distillation

Other test questions

  1. Describe briefly with the aid of a diagram how to separate alcohol from water by distillation.

  1. Alcohol and water can be separated by distillation.

What is the difference between the two liquids that allows them to be separated by this technique?

  1. The ink in a biro is an example of a mixture. Explain what is meant by a mixture.

  2. What technique, in a laboratory, could be used to separate the mixture of pigments in biro ink?

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