Pressure, volume and temperature of a gas

Answer Key - Grade 10 Science Worksheet - Challenge Me

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

1. 1.

   A car tire's air is at 320 kPa (absolute) and 20 °C. After a hot-day drive it is 50 °C, same volume. What is the new pressure, to 0.1 kPa, Jun?

   352.7 kPa
2. 2.

   A car tire's air is at 280 kPa (absolute) and 10 °C. After a hot-day drive it is 40 °C, same volume. What is the new pressure, to 0.1 kPa, Kira?

   309.7 kPa
3. 3.

   Kira says a balloon at 20 °C doubles in volume when warmed to 40 °C. Which reply fits, Luz?

   • Disagree: 293.15 K to 313.15 K is about 7% more
   • Agree: doubling the Celsius reading doubles the balloon's volume
   • Agree, if the pressure stays fixed
4. 4.

   Milo says squeezing a sealed syringe to half its volume halves the pressure. Which reply fits, Milo?

   • Agree: pressure and volume fall together when squeezed
   • Disagree: half the volume doubles the pressure
   • Agree, if the temperature stays the same
5. 5.

   Luz says a cold car tire reads low because cold air leaks out. Which reply fits, Noah?

   • Agree: cold opens gaps in the rubber
   • Disagree: colder air in a fixed volume has lower pressure
   • Agree: pressure rises in the cold, so the extra air must leak out
6. 6.

   A balloon in the sun expands while the outside air keeps its pressure. Which law applies, Ren?

   • Gay-Lussac's law: pressure rises in a rigid box
   • Boyle's law: volume rises as pressure rises
   • Charles's law: volume rises with temperature
7. 7.

   A car tire's volume barely changes as it heats. Which law best fits its pressure rise, Tala?

   • Gay-Lussac's law, with volume nearly fixed
   • Boyle's law, with temperature fixed
   • Charles's law, with pressure fixed
8. 8.

   Plotting a gas's volume against kelvin temperature at fixed pressure gives what shape, Zee?

   • A straight line rising from the origin
   • A curve falling toward the axis
   • A flat, level line
9. 9.

   Plotting pressure against volume at fixed temperature gives what shape, Ari?

   • A straight line rising from the origin
   • A curve that falls as volume grows
   • A flat, level line
10. 10.

    What does P × V equal at each point on a Boyle's law curve, Bo?

    • Zero at each point
    • A value that rises as the pressure rises
    • The same value at each point