IB DP Chemistry: Paper-by-Paper Exam Preparation

The assessment revision notes set out what Paper 1 and Paper 2 weigh and cover. These notes turn that into an exam-day plan – how to use the data booklet effectively, what to practise specifically for each paper, and a worked scenario – alongside the full syllabus guide and subject overview already on the site.

Using the data booklet as an exam-day tool, not a last resort

A clean copy of the chemistry data booklet is provided for every paper, at both SL and HL, and the guide deliberately maintains this to emphasise interpretation over memorisation. The single most useful piece of exam preparation here is not memorising what’s in the booklet, but knowing exactly where to find it under time pressure – practise locating constants, formulae and data (relative atomic masses, the periodic table, equations) quickly during timed practice, so flipping to the right page becomes automatic rather than something that eats into thinking time during the actual exam.

Paper 1 (36% of the final grade)

Multiple-choice questions (Paper 1A) and data-based questions (Paper 1B) drawn across the syllabus, leaning more heavily on the lower and middle command-term tiers (state, define, describe, explain, compare) than Paper 2’s extended-response questions. Because this paper covers the syllabus broadly, a topic-by-topic confidence self-audit in the final weeks is a more efficient use of revision time than repeatedly reviewing already-secure topics.

Time allocation: work through Paper 1A’s multiple-choice questions at a steady pace rather than lingering on any single question – if a multiple-choice question is not immediately clear, mark a best guess, flag it, and return only if time remains, since every multiple-choice question is worth the same regardless of difficulty.

Paper 2 (44% of the final grade)

Short-answer and extended-response questions built around the structure-and-reactivity framework, requiring sustained, connected reasoning across topics rather than isolated recall. The command terms come from the same glossary for both papers and are not assigned to either; evaluate, discuss and justify require a reasoned judgement supported by evidence.

Exam-preparation priority: because both papers draw questions across the structure-and-reactivity framework rather than testing topics as standalone blocks, revise connections between topics specifically – practise questions that require linking, say, bonding structure to reactivity, or energetics to equilibrium, rather than only revising each topic in isolation.

Worked practice scenario: a structure-linked-to-reactivity question

A Paper 2-style question describes two compounds with similar molar mass – one a simple covalent molecule, the other an ionic compound – and asks you to explain the difference in their melting points, using structure to justify your answer.

Weak answer:    "The ionic compound has a higher melting point because ionic bonds
                are stronger." -- states a fact without connecting it to structure.

Strong answer:  The ionic compound forms a giant ionic lattice, with strong
                electrostatic forces of attraction between oppositely charged ions
                extending throughout the whole structure in three dimensions,
                requiring a large amount of energy to overcome on melting. The
                simple covalent molecule instead consists of individual
                molecules held together only by weak intermolecular forces
                (e.g. van der Waals forces), which require far less energy to
                overcome, even though the covalent bonds within each molecule
                are themselves strong -- it is the WEAK forces BETWEEN molecules,
                not the strong bonds within them, that determine the melting
                point.

The strong answer explicitly separates intramolecular bonding (strong, within a molecule) from intermolecular forces (weak, between molecules) and identifies which one actually governs melting point – this intramolecular-versus-intermolecular distinction is one of the most frequently tested structure-to-property links in DP Chemistry, and confusing the two is a common way marks are lost even when the underlying facts are known.

Before/during exam checklist

• Before the exam: practise locating key data booklet pages under timed conditions until it’s automatic; complete a topic-by-topic confidence self-audit for Paper 1; practise questions that explicitly link two topics together (e.g. structure and reactivity) for Paper 2.
• During Paper 1: don’t linger on a difficult multiple-choice question – guess, flag, and move on, returning only if time allows.
• During Paper 2: when a question asks you to explain a property using structure, explicitly state which type of bonding or force is responsible, and distinguish clearly between intramolecular bonds and intermolecular forces where relevant.
• On every paper: check the data booklet before assuming a value or formula needs to be recalled from memory.

Self-test

1. Why is knowing where to find data in the booklet more valuable exam preparation than memorising its contents?
2. What kind of questions dominate Paper 1, and what command-term tier do they mostly draw from?
3. In the worked scenario, why does the ionic compound have a higher melting point despite the covalent bonds in the other compound being strong?
4. What revision approach does Chemistry’s structure-and-reactivity framework specifically reward?
5. What should you do with a multiple-choice question that isn’t immediately clear?

Answers: 1. Because the data booklet is provided for every paper at both levels, so the syllabus deliberately emphasises interpreting and applying supplied data over memorising it – exam time is better spent finding the right data quickly than trying to recall it. 2. Multiple-choice questions (Paper 1A) and data-based questions (Paper 1B), drawing mostly from the lower and middle command-term tiers (state, define, describe, explain, compare). 3. Because melting requires overcoming the forces BETWEEN particles, not the bonds within them – the ionic compound’s giant lattice has strong electrostatic forces extending throughout the structure, while the covalent molecule’s individual molecules are held together only by weak intermolecular forces, even though the covalent bonds inside each molecule are strong. 4. Revising connections between topics (e.g. how bonding structure affects reactivity) rather than treating each topic as a standalone block. 5. Mark a best guess, flag it, and move on, returning to it later only if time remains, since it carries the same value as every other multiple-choice question regardless of difficulty.

Official syllabus

International Baccalaureate Organization, Chemistry guide, Diploma Programme, first assessment 2025 (published February 2023, updated May 2023) – copy consulted via a school-hosted mirror, not ibo.org – the same source cited by the assessment revision notes and full syllabus guide. The worked scenario above is an original example written for this resource, not a reproduction of any official past or sample paper question.