Paper 1
Multiple-choice
+ data-based.
Paper 1A is multiple-choice from across both themes; Paper 1B is data-based using unfamiliar contexts. Sat in one sitting, calculator allowed and a data booklet provided.
Chemistry · SL & HL · current syllabus (first exams 2025)
IB Chemistry
IB Chemistry
question bank.
Syllabus-mapped IB-style questions across the current Chemistry syllabus — Structure (1, 2, 3) and Reactivity (1, 2, 3) themes at both SL and HL. Built for the post-2025 paper structure with Paper 1 (multiple-choice + data) and Paper 2 (short and extended response).
Aligned to the current IB syllabus AI Examiner marks to the real IB mark scheme Free to start, no card needed
Sample Question · From the bank
Paper 2
Reactivity · Equilibrium
HL 6–7
Question 9
Consider the equilibrium between sulfur dioxide and sulfur trioxide at 700 K:
2SO2(g) + O2(g) ⇌ 2SO3(g), ΔH = −198 kJ mol−1
Deduce, with a brief explanation, the effect on the position of equilibrium of increasing the total pressure at constant temperature.
[3 marks]Predict, with reasoning, the effect on Kc of increasing the temperature.
[3 marks]State the role of a catalyst in this equilibrium and explain its effect on Kc.
[2 marks]
AI Examiner ready
Answer →
Syllabus coverage
Structure.
Reactivity.
The current IB Chemistry syllabus is built around two organising ideas — Structure and Reactivity — each split into three themes. Every question on FourtyFive is mapped to a specific sub-topic.
6
themes covered
Structure × Reactivity
Structure 1
Models of the
Particulate Nature of Matter
Atomic structure, nuclear chemistry, electron configuration, the periodic table.
Structure 2
Models of
Bonding & Structure
Ionic, covalent and metallic bonding; intermolecular forces; structures of solids.
Structure 3
Classification
of Matter
Trends across the periodic table, organic chemistry, spectroscopy.
Reactivity 1
What Drives
Chemical Reactions?
Enthalpy, entropy, Gibbs free energy — the thermodynamics block.
Reactivity 2
How Much, How Fast,
How Far?
Reaction kinetics, equilibrium law, acids and bases, redox.
Reactivity 3
What Are the
Mechanisms of Reactions?
Reaction mechanisms in organic and inorganic chemistry, including electrophiles and nucleophiles (HL).
Practice every paper
Every paper,
weighted like the real exam.
FourtyFive's question bank mirrors the IB assessment model — same paper formats, time limits and weightings you'll meet on exam day.
02
Paper 2
Short answer
+ extended response.
SL: 1h 30 · 50 marks · 44% · HL: 2h 30 · 90 marks · 44%
Structured short-answer and longer extended-response questions spanning Structure and Reactivity, requiring diagrams, equations and full IUPAC notation.
ia
Internal Assessment
Individual
investigation.
~10 hours · 24 marks · 20% of grade
An open-ended chemistry investigation written up as a report — the IA rewards a well-defined research question, sound experimental method and rigorous data analysis.
Topic · Derivatives
Math AA HL
Capability86
Fluency72
Retention58
Confidence80
Awareness66
Momentum78
Mastery — last 7 sessions
Mastery score
76
/ 100
+5 this week
Strong recent performance, but retention is fading on chain-rule problems answered >14 days ago.
Capability · 86
Retention · 58
Confidence · 80
Why students stick with FourtyFive
The algorithm
earns its keep.
Every answer you submit updates a three-layer mastery score across each topic — proven capability, retention, and confidence. Topics fading from memory get pulled back into your queue before exam season. Topics with sudden drops get flagged for immediate review. You spend revision time where it actually matters.
- Updated after every answer
- Catches sudden drops, not just averages
- Cautious when the data is thin, confident when it isn't
Revision guide
How to revise IB Chemistry with a question bank.
The current Chemistry syllabus (first examined 2025) reorganised the entire course around Structure and Reactivity, dropped Paper 3 and the four options, and pushed more weight onto Paper 1B data analysis. The mark scheme still rewards the same three things: equations, units, and the right amount of working.
FourtyFive's IB Chemistry question bank is built for the new structure. Here's how to use it well.
1. Drill Reactivity 2 first
Reactivity 2 (kinetics, equilibrium, acids & bases, redox) is where most students lose the most Paper 2 marks. Hit it before you go anywhere near organic mechanisms or atomic structure recall.
2. Treat the data booklet as your eighth topic
The IB Chemistry data booklet gives you bond energies, standard enthalpies, electrode potentials, NMR shifts and IR absorptions. Memorising those is wasted effort — knowing how to find and apply them under pressure isn't. Every FourtyFive solution shows the booklet reference.
3. Write equations in full, including states and charges
Chemistry mark schemes routinely award marks for state symbols, balanced equations and correct charges. The AI Examiner flags every missing state symbol and unbalanced equation the way an IB examiner would.
4. Practise drawing mechanisms, not just labelling them
Reactivity 3 (mechanisms) is half the difference between a 6 and a 7 at HL. Use the writing tablet or Apple Pencil to draw curly arrows — the AI Examiner reads handwriting and marks mechanism diagrams to the same standard as typed answers.
5. Run a mixed-topic mock once you're four weeks out
The real exam doesn't stick to one theme per question. Once you've drilled topics in isolation, switch to mixed-topic mode and let FourtyFive interleave Structure and Reactivity questions the way Paper 2 will.
Other IB question banks
Take a different
IB subject?
FourtyFive covers six IB Diploma subjects today, all included on every plan. Cross-link to the rest of the question bank below.
FAQ
Questions,
answered.
Can't find what you're looking for? Email our student team — we usually reply same day.
How many questions are in the IB Chemistry question bank?
FourtyFive's Chemistry question bank covers every Structure and Reactivity theme in the current syllabus at both SL and HL, with thousands of questions tagged by paper, theme, sub-topic and command term. The bank grows every week.
Is the question bank aligned to the new (post-2025) IB Chemistry syllabus?
Yes — every question is mapped to the current Chemistry syllabus (first teaching September 2023, first assessment May 2025). The old Paper 3 and the four options have been retired and the question bank reflects the new Paper 1A/1B and Paper 2 structure built around Structure and Reactivity.
Does FourtyFive cover organic chemistry mechanisms?
Yes. Reactivity 3 (Mechanisms of Reactions) is fully covered, including SN1/SN2, electrophilic addition, electrophilic aromatic substitution (HL) and radical substitution. The AI Examiner marks hand-drawn curly-arrow mechanisms to the same standard as typed answers.
Does the AI Examiner mark equations, structures and graphs?
Yes. Hand-drawn organic structures, Lewis structures, energy diagrams and graphs are marked alongside balanced equations and calculations. The AI flags missing state symbols, unbalanced equations and missing units exactly the way an IB examiner would.
Can I see worked solutions and a mark scheme breakdown?
Yes. Every question has a step-by-step worked solution plus a per-mark breakdown showing where method credit, accuracy credit and reasoning marks come from — just like the real IB mark scheme.
Are the questions real IB Chemistry past papers?
No — the IBO owns the copyright on real past papers and we don't redistribute them. Every question on FourtyFive is original, written by IB Chemistry subject experts to match the style, difficulty and command terms of the real exam, and tagged to the current syllabus.
Start practising IB Chemistry today.
Structure, reactivity, every mechanism.
Free to start, no card needed. Every theme of the current Chemistry syllabus, marked by an AI Examiner against the real IB mark scheme.
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