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8th grade Why a gas pushes on its container worksheet

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Why a gas pushes on its container

Grade 8 Science Worksheet

NameDate

Circle the best answer.

  1. Box P and box Q are the same size with 12 particles each. P's motion lines are longer. Which box has the higher pressure, Ari?

    • Box Q, as its particles stay put longer
    • The same: each has 12 particles
    • Box P
    • Neither has any pressure

  2. Particle diagram: two same-size boxes with equal motion lines; box R has 20 dots, box S has 10 dots. Box R has 20 particles and box S has 10. Both are the same size and temperature. Which has the higher pressure, Bo?

    • Box R
    • Box S, as its particles have more room
    • Neither
    • The same, as the speeds match

  3. Box T is small and box U is large. Each holds 10 particles at one temperature. Which has the higher pressure, Esme?

    • The same: each has 10 particles
    • Box U, as a big box gets a big push
    • Box T, the small one
    • Neither

  4. After a long drive, the tires on Kira's car are warm and their pressure is higher. Why?

    • The road pushed on the tires
    • The air particles grew bigger
    • Warmer air particles move faster
    • Driving made new air particles inside

  5. A sealed snack bag puffs up as Luz's bus climbs a mountain road. Why?

    • The bag got lighter
    • The snacks made more gas
    • The outside air pushes less up high
    • The air particles inside got bigger

  6. Read this first

    Example data

    spacepressure
    4 L50 kPa
    2 L100 kPa
    1 L200 kPa

  7. Using the same table, predict the pressure if Noah squeezes the gas into 0.5 L. What reading is it?

    • About 400 kPa
    • About 100 kPa
    • About 250 kPa
    • About 200 kPa: same gas

  8. Pia's table is for a sealed, rigid tank warmed in 20 °C steps. Which pattern fits?

    • It doubles each step
    • It stays at 96 kPa: same gas
    • It falls about 7 kPa each step
    • It rises about 7 kPa each step

  9. Ren draws a sealed box of gas, cold and then hot. Which hot drawing is right?

    • Dots pressed against the walls
    • More dots
    • Same dots, longer motion lines
    • Bigger dots

  10. Tala draws a gas before and after it is squeezed into half the space at one temperature. Which after-drawing is right?

    • Dots with no motion lines
    • Smaller dots
    • Same dots, closer together
    • Twice as many dots

  11. Which pair of changes would both raise the pressure of Zee's sealed gas?

    • Warming it and giving it more room
    • Warming it and squeezing it
    • Cooling it and squeezing it
    • Cooling it and giving it more room
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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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