Kinetic molecular theory of gases
Grade 10 Science Worksheet
Circle the best answer, or write your answer on the line.
Air warms from 20 °C to 40 °C. By what factor does the particles' average kinetic energy change, to 0.01, Bo?
A sealed balloon warms from 25 °C to 50 °C. By what factor does the particles' average kinetic energy change, to 0.01, Esme?
A car tire's air warms from 15 °C to 45 °C on a hot day. By what factor does the average kinetic energy change, to 0.01, Jun?
At the same temperature, how do the average kinetic energies of N₂ and CO₂ particles compare, Luz?
- CO₂'s is larger, since it is heavier
- They are equal
- N₂'s is larger, since it is the main gas in air
When does a real gas act most like kinetic theory's ideal gas, Noah?
- At low pressure and high temperature
- Just at exactly 0 °C
- At high pressure and low temperature
Why do real gas particles stop acting ideal when squeezed very hard, Pia?
- They stop moving under pressure
- They grow larger as pressure rises
- Their own size and attractions start to matter
Steam from a kettle cools and condenses into drops. Which kinetic-theory idea has broken down, Ren?
- That particles take up little space
- That particles are in constant motion
- That particles do not attract each other
A balloon left in a freezer shrinks. Why, Tala?
- The particles shrink in the cold, so they fill less of the space
- Slower particles hit the rubber less hard and less often
- The particles stop moving and fall
A car tire's pressure rises after a drive on a hot day. Why, Zee?
- The particles swell in the heat and press harder on the walls
- The heat adds new particles to the tire
- Faster particles hit the tire walls harder and more often
A sealed syringe is warmed in a hand, and its plunger slides out. Why, Ari?
- Faster particles hit the plunger more
- The hand pushes air in through the seal
- The particles grow and push the plunger