Choose your level, then a unit. Every answer is followed by an explanation.
Every step makes you stronger. Start with a quiz to find out what you already know, go deeper with the practice book, then master every method with the worked-solution pack. From quiz to book to pack, you gain more skill in each topic.
Every unit has two parts. Part A covers every key idea; Part B has harder, multi-step questions and exam-level reasoning. Each answer is followed by an explanation, and the questions go from simple to difficult, in a new order each time you start a unit.
Chemistry and society, laboratory safety, states of matter, mixtures, atoms, periodic table, reactions, acids and bases, water, air, waste
Periodic trends, chemical bonding, types of reactions, salts and ions, the mole, oxygen, oxides, electrolytes, acids and bases
Carbon, nitrogen, sulfur and chlorine compounds, rates of reaction, concentration and titration, electrolysis, alkanes, alkenes and alkynes
Atomic structure and mass spectra, electron configuration, bonding and shapes, groups 1, 2 and 13–18, period 3, fertilisers, redox, energy changes
Organic chemistry from alkanes to amino acids, phase diagrams, titration, conductivity, electrolysis, enthalpy, entropy and free energy
Transition metals, extraction of metals, benzene and its derivatives, polymers, colligative properties, equilibrium, pH, Ksp, cells, kinetics, radioactivity