IB Chemistry Revision Guide (2026 Exam)
Everything you need to prepare for IB Chemistry at SL and HL on the 2023 syllabus: a paper-by-paper strategy, a 6-week revision timeline, theme-by-theme checklists, and links to free notes and flashcards. Chemistry rewards precise definitions, balanced equations, and confident data analysis — this guide shows you how to practise all three.
⭐ Predicted Topics for IB Chemistry 2026
Want to know what's most likely to come up on your exam? We track which themes and question types recur across recent Chemistry papers — favourites like bonding and structure, periodic-table trends, energy cycles and enthalpy, equilibrium and rates of reaction, acids and bases, redox, and organic mechanisms. Revise everything, but spend your final weeks on these high-probability areas: it is the smartest way to study.
Essential Chemistry command terms
In Chemistry you can have the right idea and still drop marks if you ignore the command term — it tells you how much working and reasoning to show. Three are worth knowing cold before you sit the exam.
Determine
Obtain the only possible answer — often by working through a mole calculation, reading a value off a graph, or combining several relationships. Show how the value is fixed; a bare number rarely earns full marks.
Deduce
Reach a conclusion from the information given plus your chemistry knowledge — for example assigning an oxidation state, predicting a product, or naming a bond type. State the reasoning that forces your answer, not just the result.
Explain
An AO3 reasoning term: give the causes and reasons, linked to a chemistry principle. The word 'because' should appear — a one-line statement with no reasoning will not score.
IB Chemistry Grade Calculator
Not sure what percentage you need across Paper 1 and Paper 2 (plus the Scientific Investigation) to land a 7? Use our interactive grade calculator to enter your mock or target scores and see exactly how they convert to final IB grades, based on historical Chemistry boundaries.
Know the papers
The biggest revision mistake is studying content but ignoring format. Know exactly what each paper asks for before you start practising.
Sat in one block. Paper 1A is multiple choice (SL 30 / HL 40 marks) covering the whole syllabus; Paper 1B is data-based and experimental (25 marks). The chemistry data booklet and a calculator are allowed throughout, and there is no negative marking.
- Answer every 1A question — there is no penalty for a wrong guess, so never leave a blank
- Eliminate obviously wrong distractors, then sanity-check the chemistry before choosing
- In 1B, read the data carefully, plot points with error bars and draw a clear best-fit line; state the unit when you read a gradient or intercept
- Treat uncertainties in order — absolute, then fractional, then percentage — and propagate them into the final result
Short-answer and extended-response questions across the whole syllabus (SL 50 marks / HL 90 marks, with HL-only extensions). Extended parts are marked on markbands and reward structured reasoning. The data booklet and a calculator are allowed.
- Balance every equation — including state symbols and charges — before you put a number into it
- Read the command term: "explain", "discuss" and "evaluate" need reasoning, not just a value
- Set out mole calculations line by line so the method mark survives an arithmetic slip
- Carry units and sensible significant figures (usually 2–3) to the final line — a missing unit loses the mark
The Scientific Investigation — one individual experiment written up in ≤ 3,000 words and marked out of 24 on four criteria: research design, data analysis, conclusion, and evaluation. SL and HL students do exactly the same task.
- Pick a focused research question with one clear independent and one dependent variable
- Collect at least five values of the independent variable with repeats so you can plot a graph with error bars
- Process uncertainties fully (absolute → fractional → percentage) and propagate them into your result
- Evaluate honestly: name specific systematic and random errors and suggest realistic improvements
6-week revision timeline
Starting 6 weeks out gives you enough time to go through all 6 units, identify weak spots, and do meaningful exam practice.
- Work through the notes for every theme — use the topic index on /ib-chemistry
- Learn where each constant, equation and table lives in the chemistry data booklet
- Make key-term and definition flashcards for the Structure themes (atomic models, bonding, the periodic table)
- Drill core skills until automatic: balancing equations, mole and concentration calculations, and naming organic compounds
- Attempt a full Paper 1 (1A + 1B) under timed conditions with only the data booklet and a calculator
- Practise the Paper 1B data skills — plotting with error bars, reading gradients, and propagating uncertainties
- Complete at least two full Paper 2 sets under timed conditions, including the extended-response questions
- Target your weakest theme — for many students that is energy cycles (Reactivity 1) or reaction mechanisms (Reactivity 3)
- Rehearse "explain" and "deduce" answers — link each step to a named principle or trend
- Review mark schemes — see exactly which lines of working earn method marks even with a wrong final number
- Skim every theme summary and re-do a few mixed questions rather than re-reading notes in full
- Continue daily flashcard review (due cards only) and lock down your units and significant-figure habits
- Quick scan of key relationships and where to find constants and tables in the data booklet
- Check command terms: state, determine, deduce, explain, discuss, evaluate
- Pack a working calculator and spare batteries, and get 8 hours of sleep
Revise by unit
Each unit has a different exam weight. Prioritise accordingly — but don't skip any unit entirely.
Structure 1 — Models of the particulate nature of matter
Exam weight: High — atomic structure, the mole concept and electron configuration underpin every paper
Structure 2 — Models of bonding and structure
Exam weight: Very High — ionic, covalent and metallic bonding plus shapes recur on every paper
Structure 3 — Classification of matter
Exam weight: High — periodic trends, organic structures and spectroscopy appear often
Reactivity 1 — What drives chemical reactions?
Exam weight: Very High — enthalpy, energy cycles and entropy are heavily examined
Reactivity 2 — How much, how fast and how far?
Exam weight: Very High — rates of reaction, equilibrium and acids & bases are reliable
Reactivity 3 — What are the mechanisms of chemical change?
Exam weight: High — redox, electrochemistry and organic mechanisms reward careful reasoning
IB Chemistry Revision FAQ
How long should you revise for IB Chemistry?
Start dedicated Chemistry revision about 6 weeks before the exam. That gives you time to cover the Structure and Reactivity themes, make your mole calculations and data-booklet routines automatic, and complete several full past papers under timed conditions — including the Paper 1B data-analysis section, which trips up students who only revise content.
What is on IB Chemistry Paper 1?
Paper 1 is sat in one block and has two parts: Paper 1A is multiple choice (30 marks at SL, 40 at HL) covering the whole syllabus, and Paper 1B is data-based and experimental (25 marks) testing graphing, uncertainties and evaluating a method. The data booklet and a calculator are allowed, and there is no negative marking — so answer every question.
What topics come up most in IB Chemistry?
Bonding and structure (Structure 2) and energetics, rates and equilibrium (Reactivity 1 and 2) are the heaviest and appear on every paper — Lewis structures, enthalpy cycles, equilibrium shifts, and acid–base calculations are near-guaranteed. Periodic trends, organic mechanisms (Reactivity 3) and spectroscopy also recur. Check our Predicted Topics page for the latest data-driven breakdown.
How do I get a 7 in IB Chemistry?
Balance every equation, set out mole calculations line by line so method marks survive an arithmetic slip, and carry correct units and significant figures to the final answer. Answer the exact command term — "explain" and "deduce" need reasoning, not a value. Master the data booklet and the Paper 1B data skills, and treat your Scientific Investigation IA (20%) as marks in the bank before you even sit the papers.
Turn your Chemistry revision plan into results
Aimnova builds a personalised study plan around your exam date — it tracks your progress, surfaces weak themes like energetics or organic mechanisms, and schedules exactly what to review each day.
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