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The particle model

Grade 7 · Science · 16 questions

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Tip: print on A4, cut the flashcards along the dashed lines. The answers are on the last page.

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Worksheet: The particle model

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Answer the questions.

  1. In which state of matter are the particles packed closely in a regular pattern?
    a) Gasb) Liquidc) Solidd) Steam
  2. Which state of matter has particles that are far apart and move freely?
    a) Gasb) Icec) Liquidd) Solid
  3. The particles in a solid are completely still and never move at all.
    a) Trueb) False
  4. Why can a liquid be poured?
    a) Its particles are far apartb) Its particles are fixed in placec) Its particles are very smalld) Its particles can slide past each other
  5. What is the spreading of particles from a high to a low concentration called?
    a) Condensationb) Diffusionc) Evaporationd) Melting
  6. A smell of baking spreads across a room. Which explains this?
    a) Particles of gas spread out by diffusionb) The air heats the particles upc) The particles get biggerd) The particles stop moving
  7. Diffusion is faster in a gas than in a liquid. Why? Give a reason about particles.
  8. What happens to the particles of a solid when it melts?
    a) They gain energy and can move past each otherb) They get smallerc) They move further apart than in a gasd) They stop vibrating
  9. What is the change of state from gas to liquid called?
  10. When water freezes, its particles stay the same and only their arrangement and movement change.
    a) Trueb) False
  11. What causes gas pressure on the walls of a container?
    a) Particles colliding with the wallsb) Particles getting heavierc) Particles melting on the wallsd) Particles sticking to the walls
  12. A gas is squeezed into a smaller space at the same temperature. What happens to its pressure?
    a) It becomes zerob) It decreasesc) It increasesd) It stays the same
  13. Heating a sealed gas makes its pressure rise. What do the particles do differently?
  14. Ice melts in a sealed bag and nothing escapes. How does the water's mass compare with the ice?
    a) It is lessb) It is morec) It is the samed) It is zero
  15. When a puddle evaporates, the mass of water disappears from the universe.
    a) Trueb) False
  16. Why is mass conserved when a substance changes state?
    a) Some particles disappearb) The number of particles stays the samec) The particles become biggerd) The particles get lighter

Answers

  1. Solid
  2. Gas
  3. False
  4. Its particles can slide past each other
  5. Diffusion
  6. Particles of gas spread out by diffusion
  7. Gas particles are far apart and move faster and more freely
  8. They gain energy and can move past each other
  9. Condensation
  10. True
  11. Particles colliding with the walls
  12. It increases
  13. They move faster and hit the walls harder and more often
  14. It is the same
  15. False
  16. The number of particles stays the same