IB Chemistry HL · 2025
Chemistry HL Paper 2
269 past paper questions from 5 papers across 2 exam sessions. See what repeats, then practise the same skills with AI marking.
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HL archive · from 2025
Paper 2
Latest exam session: November 2025
- questions
- 269
- questions
- papers
- 5
- papers
- exam sessions
- 2
- exam sessions
- micro-topics
- 67
Where Paper 2 marks go, by unit
In syllabus order. The ring is the share of the marks each one carries.
Unit 1
Structure 1: Models of the particulate nature of matter
11% of marks50 of the 450 marks across the 11 Chemistry HL papers analysed (11%) were on this unit. A past-paper pattern, not a guarantee for your next paper. · 27 questions
Unit 2
Structure 2: Models of bonding and structure
14% of marks65 of the 450 marks across the 11 Chemistry HL papers analysed (14%) were on this unit. A past-paper pattern, not a guarantee for your next paper. · 45 questions
- DueHybridization and sigma/pi bonds (HL)
Unit 3
Structure 3: Classification of matter
17% of marks75 of the 450 marks across the 11 Chemistry HL papers analysed (17%) were on this unit. A past-paper pattern, not a guarantee for your next paper. · 45 questions
Unit 4
Reactivity 1: What drives chemical reactions?
12% of marks55 of the 450 marks across the 11 Chemistry HL papers analysed (12%) were on this unit. A past-paper pattern, not a guarantee for your next paper. · 28 questions
- DueCalorimetry and calculating enthalpy change
Unit 5
Reactivity 2: How much, how fast and how far?
22% of marks101 of the 450 marks across the 11 Chemistry HL papers analysed (22%) were on this unit. A past-paper pattern, not a guarantee for your next paper. · 59 questions
- DueReacting masses and the limiting reactant
- DueReacting gas volumes
Unit 6
Reactivity 3: What are the mechanisms of chemical change?
23% of marks104 of the 450 marks across the 11 Chemistry HL papers analysed (23%) were on this unit. A past-paper pattern, not a guarantee for your next paper. · 65 questions
- DueThe pH scale and strong vs weak acids and bases
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 67 micro-topics for the next sitting. Numbers are questions per year.
fewermore
| Micro-topic | 2025 | 2026 |
|---|---|---|
| 14Factors affecting rate and the Maxwell–Boltzmann distribution, 2025: 14 questions | ·Factors affecting rate and the Maxwell–Boltzmann distribution, 2026: 0 questions | |
| 11Buffers, pH curves and indicators (HL), 2025: 11 questions | ·Buffers, pH curves and indicators (HL), 2026: 0 questions | |
| 11Functional groups and nomenclature, 2025: 11 questions | ·Functional groups and nomenclature, 2026: 0 questions | |
| 11Spectroscopic identification of organic compounds, 2025: 11 questions | ·Spectroscopic identification of organic compounds, 2026: 0 questions |
11 more micro-topics with a free account
- DueRate of reaction and collision theory· last May 25 P2 TZ3
- Dueusually examined, but missing from the last two exam sessions
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Questions on Paper 2, by exam session
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Frequently asked questions
Short answers about this page.
Which Chemistry HL exam sessions are covered for Paper 2?
3 exam sessions from 2025, the latest November 2025. Every Paper 2 in every timezone is read and classified in full, which gives 5 papers in this archive.
Which Paper 2 topic comes up most?
Factors affecting rate and the Maxwell–Boltzmann distribution (5.2.2): in 46% of papers, last seen Nov 25 P2 TZ3. Usually "sketch", worth about 5.4 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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