Matter - matter, particles, methods of separating substances; the atom - elements and compounds, symbols, formulas, equations, inside the atom, ions, the chemical bond; patterns of behaviour - acids and bases, salts, the periodic table, oxidation-reduction reactons; Planet Earth - air, oxygen, water, air pollution, water pollution, earth, rocks; using Earth's resources - metals, chemical cells, building materials, fuels; measurement - chemical-reaction speeds, chemical calculations, energy changes in chemical reactions; organic chemistry - alkenes and plastics, the variety of organic compounds.