Edexcel iLower SecondaryChemistry Topical2022 - 20121. Acids, bases and alkalis 2. Chemical Reaction 3. Earth and atmosphere – Composition of airy 4. Earth and atmosphere – Materials made from substances in the Earth5. Elements, atoms and compounds 6. Energy changes in reactions7. Formulae and equations8. Materials made from substances in the Earth 9. Model of an atom 10. Particle model 11. Periodic Table 12. Pure substances and mixtures13. Rate of reaction14. Reactivity series 15. Rocks16. Scientific enquiry 17. Separating mixtures Topical Solutions Watch Video