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8th grade Why a gas pushes on its container worksheet

6 printable versionsBuilding Confidence10 questions · answer keyFree · no account

Level: Building Confidence · On Level · Challenge Me

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Why a gas pushes on its container

Grade 8 Science Worksheet - Building Confidence

NameDate

Circle the best answer.

  1. Ari's science card asks what makes a gas push on the walls of its box. Which answer is right?

    • The gas resting its weight on the floor
    • Particles sticking to the walls
    • Particles growing until they touch the walls
    • Particles hitting the walls

  2. Bo's balloon stays round and firm. Why?

    • The balloon is full of solid air
    • Air particles keep hitting the rubber from inside
    • The air particles swell up to fill it
    • The rubber pulls itself outward

  3. Box A and box B hold the same number of particles. A's particles move fast; B's move slowly. Which has the higher pressure, Esme?

    • Box B, as slow particles push longer
    • The same: same number of particles
    • Box A

  4. A sealed, rigid box of air is warmed. What happens to the particles inside, Jun?

    • They slow down
    • They get bigger
    • New particles appear
    • They move faster

  5. Then what happens to the pressure in the warmed, sealed box, Kira?

    • It goes down, as warm gas is lighter
    • It goes up
    • It drops to zero
    • It stays the same: no gas was added

  6. Why does squeezing a gas into less space raise its pressure, Noah?

    • Squeezing makes more particles
    • The walls get heavier
    • Particles get squashed smaller
    • Particles hit the walls more often

  7. Pia seals the tip of a syringe and pulls the plunger out, giving the air more room. What happens to the pressure inside?

    • It stays the same: same air inside
    • It goes up
    • New air particles appear
    • It goes down

  8. Read this first

    Example data

    temperaturepressure
    20 °C100 kPa
    40 °C107 kPa
    60 °C114 kPa

  9. Ren reads the gauge table for a sealed, rigid tank as it warms. What happens to the pressure?

    • It rises
    • It falls
    • It doubles each row
    • It stays at 100 kPa: same gas

  10. Each 20 °C step adds about 7 kPa. What reading would Tala expect at 80 °C?

    • About 228 kPa
    • About 107 kPa
    • About 100 kPa
    • About 121 kPa

  11. Zee's table shows a gas at one temperature in two sizes of container. What happened when the space was halved?

    • The pressure halved
    • The pressure doubled
    • The pressure dropped to 0 kPa
    • The pressure stayed the same
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8th grade Why a gas pushes on its container worksheet – printable
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About this worksheet

Why a gas pushes on its container. Every version has 10 questions, and the answer key prints on the second page.

What your child will learn

  • I can explain gas pressure as particles hitting the walls.
  • I can predict pressure when a sealed gas is warmed, cooled, squeezed or given more room, and read the trend from a gauge table.
  • I can say that particles never grow or shrink, and that a sealed container keeps its number of particles.

Standard: MS-PS1-4

Words to know

gas pressure: The push of gas particles hitting the walls of their container

particle: A tiny piece of the gas, drawn as a dot

motion lines: Lines on a dot; longer lines mean faster motion

sealed, rigid container: Nothing gets in or out, and it can't stretch

kPa: Kilopascals, the unit on a pressure gauge

Common mistakes

Your child thought gas particles grow when warm or shrink when squeezed. Particles stay the same size; their speed or spacing changes.

Your child looked only at the number of particles. Pressure also depends on how fast they move and how much space they have.

Your child thought a sealed container gains particles. In a sealed container the number stays the same; only speed or space changes.

Questions parents ask

What is the most common mistake with why a gas pushes on its container?

Your child thought gas particles grow when warm or shrink when squeezed. Particles stay the same size; their speed or spacing changes.

Are these 8th grade science worksheets free to print?

Yes. All 6 printable versions at each level are free to print, with the answer key, and no account is needed.

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