IB Chemistry SL · 2025
Unit 6: Reactivity 3: What are the mechanisms of chemical change?
72 past paper questions from 10 papers across 3 exam sessions. See what repeats, then practise the same skills with AI marking.
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SL archive · 2025 to 2026
Unit 6: Reactivity 3: What are the mechanisms of chemical change?
Latest exam session: May 2026
- questions
- 72
- questions
- papers
- 10
- papers
- exam sessions
- 3
- exam sessions
- micro-topics
- 10
Topics in Unit 6: Reactivity 3: What are the mechanisms of chemical change?
In syllabus order. The ring is the share of the marks each one carries.
6.1
Proton transfer reactions
34% of marks32 of the 93 marks across the 10 Chemistry SL papers analysed (34%) were on this topic. A past-paper pattern, not a guarantee for your next paper. · 24 questions
6.2
Electron transfer reactions
41% of marks38 of the 93 marks across the 10 Chemistry SL papers analysed (41%) were on this topic. A past-paper pattern, not a guarantee for your next paper. · 30 questions
6.3
Electron sharing reactions
14% of marks13 of the 93 marks across the 10 Chemistry SL papers analysed (14%) were on this topic. A past-paper pattern, not a guarantee for your next paper. · 9 questions
6.4
Electron-pair sharing reactions
11% of marks10 of the 93 marks across the 10 Chemistry SL papers analysed (11%) were on this topic. A past-paper pattern, not a guarantee for your next paper. · 9 questions
Exam pattern
How often each micro-topic has been examined, year by year. Each label is explained under the grid.
Does it repeat?
Top 4 of 10 micro-topics for the next sitting. Numbers are questions per year.
fewermore
| Micro-topic | 2025 | 2026 |
|---|---|---|
| 11Oxidation states and identifying redox, 2025: 11 questions | 2Oxidation states and identifying redox, 2026: 2 questions | |
| 12The pH scale and strong vs weak acids and bases, 2025: 12 questions | 2The pH scale and strong vs weak acids and bases, 2026: 2 questions | |
| 7Radical substitution of alkanes, 2025: 7 questions | 2Radical substitution of alkanes, 2026: 2 questions | |
| 7Electrochemical cells, 2025: 7 questions | 3Electrochemical cells, 2026: 3 questions |
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Questions on Unit 6: Reactivity 3: What are the mechanisms of chemical change?, by exam session
Which papers asked about Unit 6: Reactivity 3: What are the mechanisms of chemical change?, and which question numbers. Open a paper to see them highlighted.
May 2026
11 questions across 2 papers
May 2025
32 questions across 6 papers
Specimen 2025
8 questions across 2 papers
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Frequently asked questions
Short answers about this page.
Which Chemistry SL exam sessions are covered for Unit 6: Reactivity 3: What are the mechanisms of chemical change??
3 exam sessions from 2025 to 2026, the latest May 2026. Every Paper 1 and 2 in every timezone is read and classified in full, which gives 10 papers in this archive.
Which Unit 6: Reactivity 3: What are the mechanisms of chemical change? topic comes up most?
Oxidation states and identifying redox (6.2.1): in 80% of papers, last seen May 26 P2 TZA. Usually "identify", worth about 2 marks in a paper that includes it.
Can I see the original question and mark scheme?
No. The wording belongs to the IB. You get the citation, the marks, the command term and the skill tested, plus our own matched practice questions with worked answers and AI marking.
What do "banker", "due" and "rising" mean?
Banker: examined in at least one sitting in four and still appearing. Due: regular before, but absent for the last two exam sessions. Rising: clearly more common in the last two years. Our classification of real papers, not an IB statistic.
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