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Whether you're an IB Chemistry student aiming to deepen your understanding of the syllabus or a prospective student exploring your science options, this post is here to guide you. We'll break down the IB Chemistry syllabus to give you a clear picture of what to expect in the course.
IB Chemistry Syllabus + Topics
The IB Chemistry syllabus is made up of two overarching themes – Structure and Reactivity. Each of these themes consists of a variety of topics.
In the 2025 Chemistry syllabus, only one topic is exclusive to Higher Level (HL) students. Apart from that, HL and Standard Level (SL) students cover the same topics, with HL students delving into them in greater depth.
Structure 1: Models of the particulate nature of matter
This topic focuses on how scientists represent the fundamental building blocks of matter and explain their interactions. It covers the states of matter, atomic structure based on the nuclear model, and how electron arrangements influence chemical behaviour. Students also learn about the mole as a way to measure numbers of particles, and examine gas behaviour using the ideal gas law to predict and calculate gas properties.
- Introduction to the particulate nature of matter
- The nuclear atom
- Electron configurations
- Couting particles by mass: The mole
- Ideal gases
Reactivity 1: What drives chemical reactions?
This section explores what drives chemical reactions and why they occur, with emphasis on energy changes and spontaneity. You will study how to calculate enthalpy changes, use Hess’s Law, and interpret energy diagrams to analyze reaction routes. It also covers topics such as enthalpy, entropy, spontaneity, and Gibbs free energy.
- Measuring enthalpy changes
- Energy cycles in reactions
- Energy from fuels
- Entropy and spontaneity (HL only)
Structure 2: Models of bonding and structure
This section examines how atoms bond and how these bonds shape physical and chemical properties. You will study ionic, covalent, and metallic bonding and how each leads to different types of structures. The topic also looks at how molecular shape and intermolecular attractions affect boiling points, solubility, and chemical reactivity.
- The ionic model
- The covalent model
- The metallic model
- From models to materials
Reactivity 2: How much, how fast and how far?
This topic focuses on the quantity of product produced, the speed of a reaction, and the extent to which a reaction continues before equilibrium is reached. You will use stoichiometry and moles to measure chemical amounts, apply rate laws to analyze reaction speed, and use equilibrium constants to study reversible reactions.
- How much? The amount of chemical change
- How fast? The rate of chemical change
- How far? The extent of chemical change
Structure 3: Classification of matter
This topic explains how substances are grouped according to their physical and chemical characteristics. You will learn how the periodic table is arranged and how repeating trends can be used to predict how elements behave. It also introduces organic functional groups and shows how their structures affect reactions and real-world uses.
- The periodic table: Classification of metals
- Functional groups: Classification of organic compounds
Reactivity 3: What are the mechanisms of chemical change?
This topic examines the detailed stages of various chemical reactions. You will learn about acid-base and redox processes, as well as organic reaction mechanisms, focusing on how electrons are transferred or shared during reactions. Understanding these pathways helps explain how reactions proceed in various fields of chemistry.
- Proton transfer reactions
- Electron transfer reactions
- Electron sharing reactions
- Electron-pair sharing reactions
We hope you found this post helpful. For more useful materials associated with the IB check out the wide variety of IA, EE and TOK exemplars available at Clastify and other guides available on our blog.
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