Content of the book: The world of chemistry: 1. Chemistry - the science of studying substances, 2. The achievements of chemistry, 3. Working safely in the laboratory, 4. Substances around us, 5. Separating the components of mixtures, 6. Elements and compounds; Water and air: 7. Water - the source of life, 8. Water as a solvent, 9. Acidity and alkalinity, 10. Slow and fast reactions, 11. The properties of of air, 12. Combustion and fire safety