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

S1.2 The nuclear atom

S1.3 Electron configurations

S1.4 Counting particles by mass: the mole

S1.5 Ideal gases

Structure 2 · Models of bonding and structure

S2.1 The ionic model

S2.2 The covalent model

S2.3 The metallic model

S2.4 From models to materials

Structure 3 · Classification of matter

S3.1 The periodic table: classification of elements

S3.2 Functional groups: classification of organic compounds

Theme: Reactivity

Reactivity 1 · What drives chemical reactions?

R1.1 Measuring enthalpy changes SL & HL

R1.2 Energy cycles in reactions

R1.3 Energy from fuels 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

R2.2 How fast? The rate of chemical change

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

Mini-lessons

Short, interactive lessons on a single topic — worked through step by step, then checked with questions. Free, no login.

IB HL

IB SL

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