Moving Particles of Gases and Liquids from Master File Science, Key Stage 3

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SAMPLE PAGE KS3 SCIENCE

Moving Particles

1. What is diffusion? What does this tell us about the structure of matter
(all substances)?

2. Compare the behaviour of the particles in (a) a solid, (b) a liquid and (c) a gas.

3. Explain what happens ot the paricles in a liquid if the temperature is raised above
its boiling point.

4. The rims of two gas jars, X and Y, are greased to make them gas proof. A drop of bown bromine liquid has been placed at the bottom of gas jar . Gas jar Y is then placed on top.
Draw the gas jars as you would expect to see them an hour later. Explain what has happened.

[Bromine is a very dangerous substance. This experiment can only be done in a fume cupboard by your teacher.]

5. Using a tweezers, a blue copper sulphate crystal is placed at the bottom of a beaker filled with distilled water. The beaker is covered with a glass sheet.
Draw the beaker as you would expect to see it a week later. Explain what has happened.

6. Why does the experiment in Question 4 take about an hour while the experiment in
question 5 takes several days?

7. Explain why washing on a clothes line dres better on a warm day than on a cold one.

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Science Key Stage 3. Moving Particles. Experiments to examine the movement of
the particles forming gases and liquids. Pupils are expected to discuss the practical application of their observations.
From Master File Science Key Stage 3 for 11-14 year olds.