Energy changes

Question 1

How does a solid turn to liquid

Answer 1

You have to supply more energy to weaken the forces that act between particles this energy is called latent heat of melting or enthalpy change of melting

Question 2

When solid is melting why doesn’t the temp

Answer 2

the heat energy is absorbed as the forces between particles are weakened

Question 3

What is enthalpy

Answer 3

is the heat energy change measured under constant pressure

whilst temp depends on the average kinetic energy and therefore relative to speed

Question 4

What happens when heating a liquid

Answer 4

supply energy to the particles they ove quicker and they have more kinetic energy

the particles get further apart
thats why liquids expand when heated

Question 5

energy to needed to turn a liquid to a gas is called

Answer 5

latent heat of vaporisation or enthalpy change of vaporisation no temp change in boiling