Online Chemistry Tests. Test your GCSE chemistry knowledge online. Topic-based online chemistry tests for 14-16. 4. types of inorganic reaction 5. acids, bases and salts 6. oxidation and reduction 7. the periodic table 8. chemistry of metals 9. chemistry on non-metals 10. electrolysis 11. energetics 12. rates of reaction 13. chemical equilibria 14. solubility and solubility graphs 15. inductrial processes 16. formula-moles & reacting masses 17. acid-bases titrations (inc. back) 18. organic introduction 19. hydrocarbons 20. alcohols 21. carboxylic acids and esters 22. addition polymers 23. condensation polymers – polyesters 24. Practical Inorganic Chemistry 25. Practical Organic Chemistry 26. Practical Physical Chemistry