Chemistry 0620 · 5 Chemical energetics
5.1 Exothermic and endothermic reactions
Define and identify exothermic and endothermic reactions, draw reaction pathway diagrams with activation energy, and calculate enthalpy changes using bond energies.
- Questions
- 393
- Years
- 2010–2026
- Multiple choice
- 247
- Written answer
- 146
- Average marks
- 5.5
Practise chemical energetics questions with instant markingTeachers: build a worksheet from past papers
Where this subtopic appears
- Paper 2variants 21, 22, 23134
- Paper 1variants 11, 12, 13133
- Paper 6variants 61, 62, 6344
- Paper 3variants 31, 32, 3334
- Paper 4variants 41, 42, 4324
- Paper 5variants 51, 52, 5324
Questions by year
| Year | Feb/March | May/June | Oct/Nov | Total |
|---|---|---|---|---|
| 2026 | 5 | 16 | – | 21 |
| 2024 | – | 1 | – | 1 |
| 2023 | 4 | 13 | 12 | 29 |
| 2022 | 6 | 9 | 15 | 30 |
| 2021 | 4 | 10 | 11 | 25 |
| 2020 | – | 19 | 16 | 35 |
| 2019 | 4 | 12 | 15 | 31 |
| 2018 | 6 | 17 | 22 | 45 |
| 2017 | 7 | 14 | 19 | 40 |
| 2016 | 4 | 12 | 25 | 41 |
| 2015 | 3 | 11 | 12 | 26 |
| 2014 | – | 7 | 6 | 13 |
| 2013 | – | 5 | 5 | 10 |
| 2012 | – | 5 | 10 | 15 |
| 2011 | – | 6 | 10 | 16 |
| 2010 | – | 8 | 7 | 15 |
