Chemistry 5070 · 9 Metals
9.5 Corrosion of metals
State conditions for rusting, describe barrier methods and galvanising, and explain sacrificial protection using the reactivity series and electron loss.
- Questions
- 38
- Years
- 2004–2026
- Multiple choice
- 30
- Written answer
- 8
- Average marks
- 2.9
Where this subtopic appears
- Paper 1variants 01, 11, 1228
- Paper 2variants 02, 21, 226
- Paper 4variants 04, 41, 424
Questions by year
| Year | May/June | Oct/Nov | Total |
|---|---|---|---|
| 2026 | 1 | – | 1 |
| 2023 | 3 | 2 | 5 |
| 2022 | 1 | 1 | 2 |
| 2021 | 2 | 2 | 4 |
| 2020 | 2 | – | 2 |
| 2019 | 1 | – | 1 |
| 2018 | 1 | 2 | 3 |
| 2017 | 1 | 2 | 3 |
| 2016 | 1 | 1 | 2 |
| 2015 | 2 | – | 2 |
| 2009 | 2 | – | 2 |
| 2008 | 2 | – | 2 |
| 2007 | 2 | – | 2 |
| 2006 | 2 | 2 | 4 |
| 2005 | 1 | 1 | 2 |
| 2004 | – | 1 | 1 |
