6.3.3 Particle Model and pressure (Green Topic)

Question 1

Describe the motions of gases?

Answer 1

• Particles are very far apart

- They are in constant random motion

Question 2

What is the pressure of a gas?

Answer 2

The pressure of a gas is due to the particles colliding with the walls of the container that the gas is held in.

By colliding with the walls of the container the gas particles are exerting a pressure.

Question 3

How can we increase the pressure?

Answer 3

If we increase the number of collisions per second or the energy of each collision.

Question 4

What is the temperature of a gas related to?

Answer 4

The average kinetic energy of the particles

Question 5

What happens at low temperatures?

Answer 5

At low temperatures particles have lower kinetic energy. There are fewer collisions per second. These are lower energy collisions. This means that at lower temperatures the gas pressure is relatively low.

Question 6

What happens at high temperatures?

Answer 6

At high temperatures particles have higher kinetic energy. There are more collisions per second. These are higher energy collisions. So at high temperatures the gas pressure is relatively high.