Melting And Boiling Flashcards
What happens when you heat a solid?
Particles vibrate faster
Eventually forces between them are overcome
Particles move around
Melting
What happens when you heat a liquid?
Heat energy makes particles move faster.
Gain energy to overcome attraction to each other.
Bubbles of gas form - boiling
Why are there ‘flat spots’ on a heating graph?
Where energy is used to break intermolecular bonds
Why are there ‘flat spots’ on a cooling graph?
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)
What is specific latent heat of melting?
Amount of energy needed to melt 1kg of material without changing its temperature
What is the specific latent heat of boiling?
Energy needed to boil 1kg of material without changing its temperature
What is the formula for specific latent heat?
Energy = mass x specific latent heat
Use formula triangle
