Grade 8 · Science

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 - Challenge Me

NameDate

Circle the best answer.

1.
Ari's balloon is warmed, and it stretches to a bigger size while its pressure stays about the same. Why?
- Faster hits, but fewer in more space
- Warming added particles to fill it
- The particles got bigger to fill the space
- Balloons can't change pressure
2.
A sealed syringe of air is warmed. What could Bo do with the plunger to keep the pressure the same?
- Nothing: warming can't change pressure
- Push it in to give less room
- Pull it out to give more room
- Hold it still
Read this first
Example data
trial space temperature pressure
1 1 L 20 °C 200 kPa
2 2 L 20 °C 100 kPa
3 2 L 60 °C 114 kPa
3.
Jun wants to see the effect of the space alone. Which two trials should be compared?
- Trials 1 and 2
- Trials 2 and 3
- Trials 1 and 3
- Any two trials
4.
Kira wants the effect of temperature alone. Which two trials should be compared?
- Trials 1 and 2
- Trials 2 and 3
- Trials 1 and 3
- No pair of them
5.
What do trials 2 and 3 show, Luz?
- Warming at one volume lowered the pressure
- Temperature does not change pressure
- Warming at one volume raised the pressure
- More space raised the pressure
6.
Milo says gas expands when warmed because each particle gets bigger. Agree or disagree?
- Disagree: gas shrinks when warmed
- Agree: warm particles swell up
- Disagree: particles move faster, not grow
- Agree: heat stretches each particle bigger
7.
Noah says a sealed bottle's pressure can't change unless gas is added or let out. Agree or disagree?
- Disagree: warming or squeezing changes it
- Agree: pressure depends on the amount of gas alone
- Agree: sealed means nothing changes
- Disagree: pressure changes by itself
8.
Ren wants a drawing of a gas at very high pressure in a small box. Which drawing fits best?
- Many dots close together, long motion lines
- A few giant dots filling the box
- Many dots resting still on the floor
- A few dots with short motion lines
9.
A classmate's hot-gas drawing has bigger dots than the cold one. How should Tala fix it?
- Make the dots even bigger
- Remove the motion lines
- Add more dots for the heat
- Same-size dots, longer motion lines
10.
A squeezed-gas drawing shows smaller dots than before. How should Zee fix it?
- Draw the dots stuck to the walls
- Draw extra dots from squeezing
- Make the dots smaller still
- Same-size dots, closer together

trial	space	temperature	pressure
1	1 L	20 °C	200 kPa
2	2 L	20 °C	100 kPa
3	2 L	60 °C	114 kPa

8th grade Why a gas pushes on its container worksheet – printable — Print: 1 2 3 4 5 6

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.

More grade 8 science

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