Why a gas pushes on its container

Grade 8 Science Worksheet

Circle the best answer.

1. 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?

   • The same: each has 12 particles
   • Box Q, as its particles stay put longer
   • Box P
   • Neither has any pressure
2. 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?

   • The same, as the speeds match
   • Box R
   • Box S, as its particles have more room
   • Neither
3. 3.

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

   • Box T, the small one
   • Neither
   • Box U, as a big box gets a big push
   • The same: each has 10 particles
4. 4.

   Jun's basketball, left in a cold car overnight, feels softer. Why?

   • The rubber got thicker
   • The air particles shrank in the cold
   • The cold air particles move slower
   • Some air particles were destroyed by the cold
5. 5.

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

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

6. Read this first

   Example data

   space	pressure
   4 L	50 kPa
   2 L	100 kPa
   1 L	200 kPa

7. 6.

   Milo's table shows one gas squeezed at one temperature. Which pattern fits the table?

   • The pressure does not depend on the space
   • Halving the space halves the pressure
   • The pressure goes up 50 kPa each row
   • Halving the space doubles the pressure
8. 7.

   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 rises about 7 kPa each step
   • It falls about 7 kPa each step
9. 8.

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

   • Same dots, longer motion lines
   • More dots
   • Bigger dots
   • Dots pressed against the walls
10. 9.

    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
    • Twice as many dots
    • Same dots, closer together
    • Smaller dots
11. 10.

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

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