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Boss quiz

10 questions on the whole topic. You get one try at each.

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  1. Which state of matter keeps its own shape?

    • Gas
    • Liquid
    • All three
    • Solid

  2. In which state are the particles far apart?

    • Solid
    • None of them
    • Liquid
    • Gas

  3. What do the particles in a solid do?

    • Vibrate about fixed positions
    • Stay perfectly still
    • Slide past each other
    • Fly about in every direction

  4. Drops of water form on the outside of a cold glass. What is this change of state called?

    • Freezing
    • Melting
    • Evaporating
    • Condensing

  5. What is subliming?

    • A solid turning straight into a gas
    • A gas turning into a liquid
    • A solid turning into a liquid
    • A liquid turning into a solid

  6. A pure solid is heated until it melts. What happens to its temperature while it is melting?

    • It jumps up and down
    • It keeps rising
    • It stays the same
    • It falls

  7. What causes gas pressure?

    • The weight of the container
    • Particles hitting the walls of the container
    • Particles pulling on each other
    • Particles getting bigger

  8. A sealed tin of air is heated. What happens to the pressure inside?

    • It drops to zero
    • It goes down
    • It goes up
    • It stays the same

  9. Why is diffusion faster in a gas than in a liquid?

    • Gas particles are far apart, so they travel a long way between collisions
    • Gas particles are bigger
    • Liquid particles do not move
    • Gases are always hotter than liquids

  10. A block has a mass of 40 g and a volume of 20 cm³. What is its density?

    • 60 g/cm³
    • 2 g/cm³
    • 800 g/cm³
    • 0.5 g/cm³
Answers
  1. Solid. The particles of a solid are held in fixed positions, so it keeps its shape.
  2. Gas. The particles of a gas have big gaps between them. In solids and liquids they touch.
  3. Vibrate about fixed positions. They cannot change places, but they never stop vibrating.
  4. Condensing. Water vapour in the air cools on the cold glass and turns into liquid water.
  5. A solid turning straight into a gas. Dry ice (solid carbon dioxide) sublimes. In a warm room it turns straight into a gas.
  6. It stays the same. The energy is used to break the particles away from their fixed positions, not to raise the temperature.
  7. Particles hitting the walls of the container. Each collision gives the wall a tiny push.
  8. It goes up. The particles move faster, so they hit the walls harder and more often.
  9. Gas particles are far apart, so they travel a long way between collisions. In a liquid the particles are packed together, so they keep bumping into each other and spread slowly.
  10. 2 g/cm³. Density = mass ÷ volume = 40 g ÷ 20 cm³ = 2 g/cm³.