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Particle Properties Exploration

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Particle Properties Exploration

Use the particle model and the investigation evidence to explain how solids, liquids and gases behave. Read each scenario carefully. Answer in your own words where asked.

The particle model

Imagine zooming in until you can see the tiny particles that make up matter.

1.Match each state of matter to its particle arrangement and movement.
  • Solid
  • Liquid
  • Gas
  • Particles are close together but move past one another.
  • Particles are close together and vibrate around fixed positions.
  • Particles are far apart and move freely in all directions.
2.A sealed plastic syringe contains air. When its tip is blocked, the plunger can still be pushed in a little. Which explanation best uses the particle model?
  • Air particles are tiny and there are large spaces between them, so they can be pushed closer together.
  • Air particles shrink when pressure is applied.
  • Air particles stop moving when the syringe is sealed.
  • The syringe changes the air into a liquid.
3.Why is it much harder to compress water in a sealed syringe than air?

A fair-test challenge

Hamish investigates how much different substances compress in identical syringes. She puts 20 mL of each substance into a syringe, blocks the tip and pushes the plunger with the same gentle force. She records the smallest volume reached.

Substance

Starting volume

Smallest volume

Air

20 mL

12 mL

Water

20 mL

19 mL

4.Identify the variable Hamish changed, the variable she measured and one variable she kept the same.
5.How much did the volume of the air sample decrease? Show the subtraction and include the unit.
6.Use a result from the table as evidence to support the claim that gases are more compressible than liquids.
7.Hamish repeats each test three times and gets similar results each time. Why is repeating a test useful?
  • It helps check that the results are consistent and not due to chance or a one-off mistake.
  • It guarantees the explanation is correct, even if the method is unfair.
  • It changes the substance into a different state.
  • It means the measurements do not need to be recorded.

Model, test and improve

Particle models help explain evidence, but models are simplified representations of real matter.

8.A student draws gas particles as large dots packed tightly together. What important feature should be changed to make the model explain why gas compresses easily?
9.Draw particle models for a liquid and a gas in the boxes. Keep particle size similar in both. Show the liquid particles close together and the gas particles far apart. Add arrows to show how the particles move.
10.True or false? In a solid, particles do not move at all. Correct the statement if it is false.
TrueFalse

3 printable pages

  • Particle Properties Exploration, page 1 of 3: The particle model

    Page 1

  • Particle Properties Exploration, page 2 of 3: A fair-test challenge

    Page 2

  • Particle Properties Exploration, page 3 of 3: Model, test and improve

    Page 3

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