Gas Particles and Temperature
IGCSE Edexcel Physics
5.15-5.19 Gas Molecules
Key Concepts:
Gas molecules move randomly. Higher temperature means higher average kinetic energy. Absolute zero is $-273^\circ C$.
Section A: Concepts
1. Describe the motion of gas molecules in a container.
[2]
2. Explain why gases exert pressure on container walls.
[2]
3. Explain why there is an absolute zero of temperature.
[2]
4. Convert $20^\circ C$ to Kelvin.
[1]
Total marks: 7
Mark Scheme
1.
Random motion in all directions [2]
2.
Collisions with walls produce force per unit area [2]
3.
At absolute zero average kinetic energy is minimum [2]
4.
$20 + 273 = 293\,K$ [1]