Atoms, elements and compounds

3 lessons in Atomic structure and the periodic table.

16 exam questions · 28 marks

1.1 Atoms, elements, compounds and mixtures What atoms, elements, compounds and mixtures are, how to read chemical symbols and formulae, and why compounds can only be separated by chemical reactions while mixtures can be separated by physical processes. AQA Edexcel OCR 5 questions 1.2 Word and balanced symbol equations How to write word equations and balanced symbol equations, why equations must balance (conservation of mass), how to balance them by changing the numbers in front of formulae, and how to add state symbols. AQA Edexcel OCR 6 questions 1.3 Hazard symbols and working safely Edexcel: the hazard pictograms on chemical containers (flammable, oxidising, corrosive, toxic, harmful, health hazard, environmental hazard, explosive), what they warn about, and how to evaluate risks and choose precautions in practical work. Edexcel 5 questions