Topic 3, Part 2 - Particle model of matter Flashcards
Do you keep the same amount of mass when a change state happens
when a change of state happens the mass is still conserved.
How to change the state of a solid
Melting - Liquid
sublimating - Gas
How to change the state of a liquid
Freezing - Solid
Boiling/evaporating - Gas
How to change the state of a gas
Condensing - liquid
deposition - solid
What is specific latent heat
it is the energy needed to change the state of a substance of a 1Kg mass
example of specific latent heat
When you heat up the water in a stove, the water will never get hotter than 100°c. if you carry on heating it, it won’t get any hotter
why does a change of state require energy
when melting/boiling a substance, still adding energy, increases the internal energy, this breaks down the intermolecular bonds.
On the heating graph, why are there flat spots for specific latent heat
this is where energy is being transferred by heating but not being used to change the temperature
on the freezing graph, why are there flat spots for specific latent heat
this is where bonds are forming between particles, which release energy. this decrease the internal energy but temp does go up
what is the name of the process where energy is needed to change the state of a substance
Specific latent heat
What is the equation for Specific Latent heat
Energy (F) = Mass (M) X Specific latent heat (L)
Energy - (J)
Mass - (kg)
Specific latent heat - (J/Kg)
