Melting And Boiling

Question 0

What happens when you heat a solid?

Answer 0

Particles vibrate faster
Eventually forces between them are overcome
Particles move around
Melting

Question 1

What happens when you heat a liquid?

Answer 1

Heat energy makes particles move faster.
Gain energy to overcome attraction to each other.
Bubbles of gas form - boiling

Question 2

Why are there ‘flat spots’ on a heating graph?

Answer 2

Where energy is used to break intermolecular bonds

Question 3

Why are there ‘flat spots’ on a cooling graph?

Answer 3

When condensing or freezing bonds are forming which releases energy
Temperature doesn’t go down until all substance has turned into liquid (condensing) or solid (freezing)

Question 4

What is specific latent heat of melting?

Answer 4

Amount of energy needed to melt 1kg of material without changing its temperature

Question 5

What is the specific latent heat of boiling?

Answer 5

Energy needed to boil 1kg of material without changing its temperature

Question 6

What is the formula for specific latent heat?

Answer 6

Energy = mass x specific latent heat

Use formula triangle