Pressure, volume and temperature of a gas

Answer Key - Grade 10 Science Worksheet

Circle the best answer, or write your answer on the line.

1. 1.

   A 2 L balloon at 27 °C is warmed to 77 °C at constant pressure. What is its new volume, to 0.01 L, Bo?

   2.33 L
2. 2.

   A 1.5 L balloon at 20 °C is warmed to 60 °C at constant pressure. What is its new volume, to 0.01 L, Esme?

   1.7 L
3. 3.

   A 4 L balloon at 30 °C is moved to a 10 °C room at constant pressure. What is its new volume, to 0.01 L, Jun?

   3.74 L
4. 4.

   A sealed syringe holds 40 mL of air at 1 atm. The plunger is pushed to 20 mL at the same temperature. What is the pressure, Kira?

   • 1 atm, since the air is sealed
   • 2 atm
   • 0.5 atm
5. 5.

   Why does a sealed syringe get harder to push as the plunger goes in, Milo?

   • Smaller volume means higher pressure pushing back
   • The pressure falls as the volume falls, so it sticks
   • The air's temperature drops when squeezed
6. 6.

   A balloon from a cool room is left in a warm car. Why does it get bigger, Pia?

   • Warmer gas takes up less space, so the rubber stretches
   • The car's air leaks into the balloon
   • Warmer gas takes up more space at the same pressure
7. 7.

   A 1.5 L balloon at 250 K warms to 300 K at constant pressure. What is its new volume, Ren?

   • 1.25 L
   • 1.5 L, as nothing escapes
   • 1.8 L
8. 8.

   A car tire's air is at 300 K and 330 kPa (absolute). On a hot day it reaches 330 K. What is the new pressure, Tala?

   • 330 kPa, as the tire is sealed
   • 363 kPa
   • 300 kPa
9. 9.

   Why do drivers check tire pressure before a long drive on a hot day, Zee?

   • Heat lets air leak out through the rubber
   • Warmer air in the fixed tire volume raises the pressure
   • Heat lowers the pressure, so the tire goes soft
10. 10.

    A sealed glass jar of air warms in the sun from 280 K to 350 K. By what factor does its pressure change, Ari?

    • 1.25 times higher
    • 0.8 times, so lower
    • Unchanged, since the jar is sealed