specific latent heat

Question 1

what does a change of state require

Answer 1

energy

Question 2

what happens when a substance is melting or boiling

Answer 2

you are still putting energy in so it increases the internal energy
but the energy is used for breaking bonds between particles

Question 3

what happens when a substance is condensing or freezing

Answer 3

bonds are forming between particles which release energy and its internal energy decreases but the temp doesn’t do down until all the substance has turned to a liquid or solid

Question 4

what is the energy needed to change the state if a substance

Answer 4

latent heat

Question 5

what is specific latent heat

Answer 5

the amount of energy needed to change 1kg of it from one state to another without changing its temp

Question 6

what happens when cooling

Answer 6

specific latent heat is the energy released by a change in state

Question 7

what is specific latent eat between a solid and liquid called

Answer 7

specific latent heat of fusion

Question 8

what is the specific latent heat for changing between a liquid and gas

Answer 8

specific latent heat of vaporisation

Question 9

what is the formula for specific latent heat

Answer 9

energy = mass x specific latent heat

E = ml