Kinetic Theory of Matter
What You Will Learn: Kinetic Theory of Matter · The Particle Model of Matter · Kinetic Energy and Temperature · Applying the Kinetic Theory to Everyday Phenomena
IB Chemistry topic guide
Structure 1: Particulate Nature
Structure 1: Particulate Nature is a core part of IB Chemistry. This guide connects the syllabus ideas behind Kinetic Theory of Matter, Changes of State, Gas Behaviour and Diffusion, Atomic Structure and Isotopes, Mass Spectrometry and Atomic Models and 4 more units, shows how they appear in worked problems, and points you to the formulas and full lessons needed for exam revision.
What you will learn
Structure 1: Particulate Nature syllabus outline
The units below follow the structure used in the full Study to Learn course. Use the outline to identify exactly which idea needs attention, then work through the public example before continuing to the complete lesson path.
Changes of State
What You Will Learn: Changes of State · Melting, Boiling, and Sublimation · Heating Curves and Latent Heat
Gas Behaviour and Diffusion
What You Will Learn: Gas Behaviour and Diffusion · Properties of Gases · Diffusion and Brownian Motion
Atomic Structure and Isotopes
What You Will Learn: Atomic Structure and Isotopes · Inside the Atom: Protons, Neutrons, and Electrons · Isotopes and Relative Atomic Mass
Mass Spectrometry and Atomic Models
What You Will Learn: Mass Spectrometry and Atomic Models · The Mass Spectrometer · Historical Development of Atomic Models
Energy Levels and Orbitals
What You Will Learn: Energy Levels and Orbitals · Shells, Subshells, and Orbitals · The Periodic Table as an Electron Configuration Map
Ionisation Energy
What You Will Learn: Ionisation Energy · Definition and Successive Ionisation Energies · Trends and Irregularities in First Ionisation Energy
The Mole Concept
What You Will Learn: The Mole Concept · Counting Particles by Mass · Concentration, Dilution, and Reacting Quantities
Ideal Gases
What You Will Learn: Ideal Gases · The Ideal Gas Law · Why Real Gases Aren’t Quite Ideal
Free worked preview
What You Will Learn: Kinetic Theory of Matter
This complete preview comes from the Kinetic Theory of Matter unit. It introduces the core language, shows the method in context, and gives you a real example of the lesson quality before you create an account.
What You Will Learn: Kinetic Theory of Matter
This topic opens the entire IB Chemistry course by asking what matter is actually made of and how its behaviour follows from that. The three lessons build in order: first establishing that all matter consists of particles in constant motion, then linking that motion quantitatively to temperature, and finally using the model to explain everyday phenomena that would otherwise seem mysterious. Together they lay the foundation for changes of state (A1.2) and gas behaviour (A1.3) later in this section, and the particle-motion ideas introduced here resurface throughout the course, from reaction rates (E2) to entropy (D4).
What You'll Cover
- How the arrangement and motion of particles differs between solids, liquids, and gases, and the experimental evidence that supports the particle model.
- Why temperature measures average kinetic energy, and why lighter particles move faster than heavier ones at the same temperature.
- How the kinetic particle model explains real phenomena such as gas pressure, evaporative cooling, and why a puddle dries even on a cool day.
By the end of this topic you will be able to explain everyday physical behaviour of matter purely in terms of invisible particle motion.
Reviewed by the Study to Learn editorial team · Updated 2026-08-04