Changes of state Flashcards
1
Q
What does a pure substance have?
A
A precise melting and boiling point
2
Q
Where and when does evaporation occur?
A
From the surface of the liquid just below the boiling point
3
Q
What does increasing the temperature of a substance do?
A
Increases the internal energy and allows a substance to change state
4
Q
On a temperature time graph, what are changes of state?
A
Changes of state are flat lines
5
Q
What is the specific latent heat of vaporisation?
A
Amount of energy needed to turn1kg of a substance from a liquid to a gas
6
Q
What is the specific latent heat of fusion?
A
Amount of energy needed to turn 1kg of a substance from a solid to a liquid
