Kinetic molecular theory of gases
Grade 10 Science Worksheet - Building Confidence
Circle the best answer, or write your answer on the line.
The gas in a sealed balloon goes from 300 K to 600 K. Average kinetic energy is proportional to kelvin temperature. By what factor does it change, Ari?
A sealed bottle of air goes from 250 K to 375 K. Average kinetic energy is proportional to kelvin temperature. By what factor does it change, Bo?
A sealed box of air goes from 280 K to 350 K. Average kinetic energy is proportional to kelvin temperature. By what factor does it change, to 0.01, Kira?
Which is a claim of kinetic molecular theory, Jun?
- Gas particles sit still until the gas is heated
- Gas particles fill most of the space in a container
- Gas particles move fast, in random straight lines
In kinetic molecular theory, how much of a gas's volume do the particles themselves take up, Luz?
- Very little; a gas is mostly empty space
- Most of it; the particles touch
- Nearly the whole volume, once heated particles swell
What causes the pressure inside a balloon, Noah?
- The weight of gas particles resting on the bottom
- The particles swelling against the rubber
- Gas particles hitting the inside of the balloon
Air is pumped into a bike tire at the same temperature. Why does the pressure rise, Pia?
- More particles hit the walls each second
- The particles stop and press on the walls
- Each particle grows bigger in the tire
What does a gas's kelvin temperature measure, Tala?
- How many particles it has
- The size of its particles
- The average kinetic energy of its particles
At 0 K, what would gas particles' average kinetic energy be in kinetic theory, Zee?
- Zero, but the particles would be at their largest size
- Zero, since energy follows kelvins
- The same as at room temperature
Why must kinetic energy comparisons use kelvins, not °C, Esme?
- Celsius numbers are too small to divide
- Kelvins start at zero energy, so ratios make sense
- Kelvins measure the particles' size