Chapter 3: Particle model of matter

Question 1

What is specific latent heat?

Answer 1

The amount of energy required for 1kg of a substance to change state. The energy required to change the state of 1kg of a substance with no change in temperature. E = mL

Question 2

What is the particle model of gases?

Answer 2

A theory explaining the behaviour of gases which explains that:

• Particles in a gas are in a constant state of random motion
• Particles in a gas collide with each other and the walls of their container without losing any kinetic energy
• As the kinetic energy of the molecules increases, the temperature of the gas increases
• The temperature of the gas is related to the average kinetic energy of all the particles

Question 3

What is pressure?

Answer 3

The force per unit area which gas particles exert on each other and the walls of their container

Question 4

What is the formula that links pressure and volume?

Answer 4

Pressure * volume = constant