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, which moves faster on average: O₂ (32.00 g/mol) or CO₂ (44.01 g/mol), Kira?
- O₂, since lighter particles move faster at equal energy
- CO₂, since heavier particles move faster and hit the walls harder
- Neither: equal temperature means equal speed
At the same temperature, how do the average kinetic energies of N₂ and CO₂ particles compare, Luz?
- They are equal
- CO₂'s is larger, since it is heavier
- 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?
- Just at exactly 0 °C
- At high pressure and low temperature
- At low pressure and high temperature
Why do real gas particles stop acting ideal when squeezed very hard, Pia?
- Their own size and attractions start to matter
- They stop moving under pressure
- They grow larger as pressure rises
Steam from a kettle cools and condenses into drops. Which kinetic-theory idea has broken down, Ren?
- That particles are in constant motion
- That particles do not attract each other
- That particles take up little space
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
- Faster particles hit the tire walls harder and more often
- The heat adds new particles to the tire
A sealed syringe is warmed in a hand, and its plunger slides out. Why, Ari?
- The particles grow and push the plunger
- The hand pushes air in through the seal
- Faster particles hit the plunger more