CHEMISTRY PHYSICAL AND CHEMICAL CHANGES ATOMIC THEORY MATTER THE MOLE CHEMICAL FORMULAE, EQUATIONS PERIODICITY GASES ACIDS, BASES, SALTS ELECTRICITY AND CHEMICALS OXIDATION AND REDUCTION CHEMICAL REACTIONS AND QUILIBRIUM RADIOACTIVITY AIR AND COMBUSTION WATER AND SOLUTION OXYGEN HYDROGEN CARBON ORGANIC CHEMISTRY SILICON HALOGENS SULPHUR METALS QUESTIONS AND ANSWERS