Grade 7Sciencequiz16 questions

The particle model

Grade 7: particles in solids, liquids and gases, diffusion, changes of state explained by particles, gas pressure, mass is conserved.

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Free to play. Teams answer on one screen; your phone is the remote. No student devices.

Questions

  1. In which state of matter are the particles packed closely in a regular pattern?

    • Gas
    • Liquid
    • Solid
    • Steam
    Show answerSolid

  2. Which state of matter has particles that are far apart and move freely?

    • Gas
    • Ice
    • Liquid
    • Solid
    Show answerGas

  3. The particles in a solid are completely still and never move at all. (True or false?)

    Show answerFalse

  4. Why can a liquid be poured?

    • Its particles are far apart
    • Its particles are fixed in place
    • Its particles are very small
    • Its particles can slide past each other
    Show answerIts particles can slide past each other

  5. What is the spreading of particles from a high to a low concentration called?

    • Condensation
    • Diffusion
    • Evaporation
    • Melting
    Show answerDiffusion

  6. A smell of baking spreads across a room. Which explains this?

    • Particles of gas spread out by diffusion
    • The air heats the particles up
    • The particles get bigger
    • The particles stop moving
    Show answerParticles of gas spread out by diffusion

  7. Diffusion is faster in a gas than in a liquid. Why? Give a reason about particles. (Answer out loud)

    Show answerGas particles are far apart and move faster and more freely

  8. What happens to the particles of a solid when it melts?

    • They gain energy and can move past each other
    • They get smaller
    • They move further apart than in a gas
    • They stop vibrating
    Show answerThey gain energy and can move past each other

  9. What is the change of state from gas to liquid called? (Answer out loud)

    Show answerCondensation

  10. When water freezes, its particles stay the same and only their arrangement and movement change. (True or false?)

    Show answerTrue

  11. What causes gas pressure on the walls of a container?

    • Particles colliding with the walls
    • Particles getting heavier
    • Particles melting on the walls
    • Particles sticking to the walls
    Show answerParticles colliding with the walls

  12. A gas is squeezed into a smaller space at the same temperature. What happens to its pressure?

    • It becomes zero
    • It decreases
    • It increases
    • It stays the same
    Show answerIt increases

  13. Heating a sealed gas makes its pressure rise. What do the particles do differently? (Answer out loud)

    Show answerThey move faster and hit the walls harder and more often

  14. Ice melts in a sealed bag and nothing escapes. How does the water's mass compare with the ice?

    • It is less
    • It is more
    • It is the same
    • It is zero
    Show answerIt is the same

  15. When a puddle evaporates, the mass of water disappears from the universe. (True or false?)

    Show answerFalse

  16. Why is mass conserved when a substance changes state?

    • Some particles disappear
    • The number of particles stays the same
    • The particles become bigger
    • The particles get lighter
    Show answerThe number of particles stays the same

Play it as a game

Penalty KickAnswer right to take a penalty: left or right for 2, the top corner for 3. Will the keeper save it?Fishing PondAnswer right to cast at a buoy: fish worth 1 to 3, the golden fish for 5, or a silly old boot!Claw MachineAnswer right to work the claw: grab a plush prize, but the big ones slip more often!Lucky DropAnswer right to drop a ball through the pegs. Every bucket scores, and the golden one is worth 10!

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