Heating and cooling
I can explain why some changes of state are exothermic and some are endothermic.
Heating and cooling
I can explain why some changes of state are exothermic and some are endothermic.
These resources will be removed by end of Summer Term 2025.
Lesson details
Key learning points
- Heating transfers energy into a substance and can cause it to melt, evaporate or boil.
- Melting, evaporation and boiling are endothermic.
- As it cools, a substance transfers energy into the surroundings by heating and it may condense or freeze.
- Condensing and freezing are exothermic.
Keywords
Endothermic - When a substance transfers energy in from the surroundings, e.g. melting, boiling and evaporating.
Exothermic - When a substance transfers energy out to the surroundings by heating, e.g. condensing and freezing.
Common misconception
Energy can appear and disappear.
Remind students about the conservation of energy.
Content guidance
- Risk assessment required - equipment
Supervision
Adult supervision required
Licence
This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
Lesson video
Loading...
Starter quiz
6 Questions
Exit quiz
6 Questions
particles are in fixed positions, and vibrate more
particles becoming randomly arranged and can move
particles in liquid state move past each other and faster
energy used to overcome liquid particle attractive forces
particles in gas state use energy to move faster