Chemistry 5070 · 5 Chemical energetics
5.1 Exothermic and endothermic reactions
Define enthalpy change and activation energy, draw reaction pathway diagrams, and calculate enthalpy changes using bond breaking and making energies.
- Questions
- 157
- Years
- 2004–2026
- Multiple choice
- 91
- Written answer
- 66
- Average marks
- 4.9
Practise chemical energetics questions with instant markingTeachers: build a worksheet from past papers
Where this subtopic appears
- Paper 1variants 01, 11, 1289
- Paper 4variants 04, 41, 4237
- Paper 2variants 02, 21, 2227
- Paper 3variants 31, 324
Questions by year
| Year | May/June | Oct/Nov | Total |
|---|---|---|---|
| 2026 | 6 | – | 6 |
| 2023 | 4 | 10 | 14 |
| 2022 | 8 | 8 | 16 |
| 2021 | 1 | 9 | 10 |
| 2020 | 4 | 7 | 11 |
| 2019 | 6 | 12 | 18 |
| 2018 | 5 | 9 | 14 |
| 2017 | 4 | 5 | 9 |
| 2016 | 5 | 3 | 8 |
| 2015 | 3 | 4 | 7 |
| 2014 | 1 | 2 | 3 |
| 2013 | 2 | 2 | 4 |
| 2012 | 1 | – | 1 |
| 2011 | 1 | 1 | 2 |
| 2009 | 1 | 4 | 5 |
| 2008 | 4 | 3 | 7 |
| 2007 | 4 | 5 | 9 |
| 2006 | 3 | 2 | 5 |
| 2005 | 4 | 2 | 6 |
| 2004 | – | 2 | 2 |
