Classifying matter by particles
Classifying matter by particles

Matter is made of particles such as atoms, molecules and ions. An element contains only one type of atom, while a compound contains atoms of different elements chemically bonded in a fixed ratio.
Step-by-step lessons covering Edexcel IGCSE Chemistry Elements, compounds and mixtures for IGCSE Chemistry. Each lesson works through exam-style questions in Paper 1 and Paper 2 format. Build a solid grasp of atomic structure, bonding and the mole concept early, since these underpin almost every other topic, then move on to the more calculation-heavy quantitative and organic chemistry content.