IB Chemistry HL · 2025
IB Chemistry HL past papers
921 past paper questions from 16 papers across 3 exam sessions. See what repeats, then practise the same skills with AI marking.
Starter set across the most-tested skills, with AI marking and model answers.
HL archive · 2025 to 2026
IB Chemistry HL past papers
Latest exam session: May 2026
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Units in Chemistry HL
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
17% of marks · 152 questions
Unit 2
Structure 2: Models of bonding and structure
13% of marks · 126 questions
Unit 3
Structure 3: Classification of matter
15% of marks · 143 questions
Unit 4
Reactivity 1: What drives chemical reactions?
12% of marks · 101 questions
Unit 5
Reactivity 2: How much, how fast and how far?
23% of marks · 210 questions
Unit 6
Reactivity 3: What are the mechanisms of chemical change?
20% of marks · 189 questions
Papers in Chemistry HL
Each paper across every sitting. The ring is the share of the marks it carries.
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 77 micro-topics for the next sitting. Numbers are questions per year.
fewermore
| Micro-topic | 2025 | 2026 |
|---|---|---|
| 18Functional groups and nomenclature, 2025: 18 questions | 13Functional groups and nomenclature, 2026: 13 questions | |
| 18Factors affecting rate and the Maxwell–Boltzmann distribution, 2025: 18 questions | 16Factors affecting rate and the Maxwell–Boltzmann distribution, 2026: 16 questions | |
| 10Oxidation states and identifying redox, 2025: 10 questions | 6Oxidation states and identifying redox, 2026: 6 questions | |
| 18Rate equation, order and rate constant (HL), 2025: 18 questions | 10Rate equation, order and rate constant (HL), 2026: 10 questions |
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Frequently asked questions
Short answers about this page.
Which Chemistry HL exam sessions are covered?
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 16 papers in this archive.
Which IB Chemistry HL topic comes up most?
Functional groups and nomenclature (3.2.3): in 100% of papers, last seen May 26 P2 TZ3. Usually "Identify / State", worth about 2.4 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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Reading this page and the exam pattern is free. A free account generates three sets of ten questions and launches one practice set. Pro opens every question in any scope, sets of twenty or all, and unlimited practice.
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Every question, by paper
What each Chemistry HL paper tests across all its sittings: the marks by unit and the micro-topics it keeps coming back to.
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Every formula you are given in the exam, with when to use it and the traps around it.
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All IB past papers
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