Chemistry 9701 · 5 Chemical energetics
5.2 Hess’s law
Apply Hess's law to construct energy cycles and calculate enthalpy changes from experimental or bond energy data.
- Questions
- 60
- Years
- 2015–2026
- Multiple choice
- 32
- Written answer
- 28
- Average marks
- 6.4
Practise chemical energetics questions with instant markingTeachers: build a worksheet from past papers
Where this subtopic appears
- Paper 1variants 11, 12, 13, 1432
- Paper 3variants 31, 32, 33, 34, 35, 3611
- Paper 2variants 21, 22, 236
- Paper 4variants 41, 436
- Paper 5variants 51, 52, 535
Questions by year
| Year | Feb/March | May/June | Oct/Nov | Total |
|---|---|---|---|---|
| 2026 | – | 4 | – | 4 |
| 2023 | – | 1 | 2 | 3 |
| 2022 | – | 1 | 5 | 6 |
| 2021 | 1 | 4 | 2 | 7 |
| 2020 | 1 | 4 | 3 | 8 |
| 2019 | 1 | 3 | 3 | 7 |
| 2018 | 1 | 4 | 2 | 7 |
| 2017 | 1 | 2 | 3 | 6 |
| 2016 | 1 | 4 | 2 | 7 |
| 2015 | – | 4 | 1 | 5 |
