17.1
Exothermic and endothermic
Reactions that give out energy and reactions that take it in, and how a thermometer tells you which.
17.2
Measuring temperature changes
Reading a thermometer, working out a temperature change, keeping the energy in, and a fair test with four metals.
17.3
Energy and changes of state
Melting, boiling and freezing: where the energy goes while the temperature stays the same.
17.4
Breaking and making bonds
Why some reactions give out energy and others take it in: breaking bonds takes energy in, making bonds gives it out.
Daily 5
Five quick diagram questions a day from this unit. The ones you get wrong come back sooner. Progress saves in this browser.
What this unit covers
Mapped to the KS3 national curriculum (Chemistry: energetics).
| Programme of study | Lesson |
|---|---|
| exothermic and endothermic chemical reactions (qualitative) | 17.1, 17.2, 17.4 |
| energy changes on changes of state (qualitative) | 17.3 |