IB Diploma · Chemistry

IB Chemistry Revision

Interactive topic lessons for the current IB Chemistry guide (first assessment 2025), organised by the Structure and Reactivity themes. Higher Level and Standard Level are separate — pick your level for each sub-topic.

Content follows the current Chemistry guide (first assessment 2025): two themes — Structure (the nature of matter) and Reactivity (how and why reactions occur). Most sub-topics have both SL and HL content; a few contain Additional Higher Level (AHL) material, and Reactivity 1.4 (Entropy and spontaneity) is HL only.
SL lesson HL lesson coming soon

Theme: Structure

Structure 1 · Models of the particulate nature of matter
S1.1 Introduction to the particulate nature of matter SL & HL
SL + HL
S1.2 The nuclear atom
SLHL
S1.3 Electron configurations
SLHL
S1.4 Counting particles by mass: the mole
SLHL
S1.5 Ideal gases
SLHL
Structure 2 · Models of bonding and structure
S2.1 The ionic model
SLHL
S2.2 The covalent model
SLHL
S2.3 The metallic model
SLHL
S2.4 From models to materials
SLHL
Structure 3 · Classification of matter
S3.1 The periodic table: classification of elements
SLHL
S3.2 Functional groups: classification of organic compounds
SLHL

Theme: Reactivity

Reactivity 1 · What drives chemical reactions?
R1.1 Measuring enthalpy changes SL & HL
SL + HL
R1.2 Energy cycles in reactions
SLHL
R1.3 Energy from fuels SL & HL
SL + HL
R1.4 Entropy and spontaneity HL only
SL —HL
Reactivity 2 · How much, how fast and how far?
R2.1 How much? The amount of chemical change SL & HL
SL + HL
R2.2 How fast? The rate of chemical change
SLHL
R2.3 How far? The extent of chemical change
SLHL
Reactivity 3 · What are the mechanisms of chemical change?
R3.1 Proton transfer reactions
SLHL
R3.2 Electron transfer reactions
SLHL
R3.3 Electron sharing reactions
SLHL
R3.4 Electron-pair sharing reactions
SLHL

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