S1.1 Introduction to the particulate nature of matter

S1.2 The nuclear atom

S1.3 Electron configurations

S1.4 Counting particles by mass: The mole

S2.1 The ionic model

S2.2 The covalent model

S2.3 The metallic model

S2.4 From models to materials

S3.1 The periodic table: Classification of elements

S3.2 Functional groups: Classification of organic compounds

R1.1 Measuring enthalpy change

R1.2 Energy cycles in reactions

R1.3 Energy from fuels

R1.4 Entropy and spontaneity (HL)

R2.1 How much? The amount of chemical change

R2.2 How fast? The rate of chemical change

R2.3 How far? The extent of chemical change

R3.1 Proton transfer reactions

R3.2 Electron transfer reactions

R3.3 Electron sharing reactions

R3.4 Electron-pair sharing reactions