What everything is made of, why it changes state, and what is really happening when two substances react — chemistry built from the atom outwards.
Atoms, the table that organises them, and the two ways they join up. Nothing else in chemistry works without these four.
Atomic structure, elements, the periodic table, and atomic number vs mass number.
Groups, periods, trends, metals and non-metals, and key element families.
Elements, compounds, and mixtures — properties, formation, and separation techniques.
Ionic, covalent and metallic bonds
Solid, liquid, gas — and what heat actually does to the particles when a substance switches between them.
Solid, liquid, gas and phase changes
Melting, freezing, evaporation and condensation
Heat transfer by conduction, convection, and radiation; insulation and thermal equilibrium.
What density means, how to calculate it, why objects float or sink, and how to measure the density of irregular objects.
Reactions, the acid–base family that shows up in every lab and kitchen, and why materials are chosen for the jobs they do.
Two consequences of particles never sitting still — one that keeps cells alive, one you feel every time you inflate a tyre.