| Question | Answer |
| 1. Chemical formula for water? | H2O |
| 2. Passing water through a wire mesh to remove floating debris is called? | Screening |
| 3. The 2 chemicals used to test for water are? | 1. Cobalt chloride paper
2. Anhydrous copper sulphate |
| 4. Chlorine is added to water to? | Kill bacteria |
| 5. Addition of fluorine to prevent tooth decay is called? | Fluoridation |
| 6. Expands on freezing?
Water is a good solvent
Boils at 100, freezes at 0
These are all examples of? | Physical properties of water |
| 7. The elements responsible for hardness in water? | Calcium and Magnesium |
| 8. Definition of hard water? | Water that does not easily form a lather with soap |
| 9. Chemical used to test for water hardness? | Soap |
| 10. 2 ways to remove water hardness? | Boiling and Ion exchanger |
| 11. The ions that replace calcium ions to remove hardness in an ion exchanger? | Sodium ions |
| 12. Water hardness is a problem in these areas? | Limestone |
| 13. White deposit that build up on the inside of pipes in hard water areas? | Limescale |
| 14. The chemical name for limestone? | Calcium carbonate |
| 15. The name of acid rain formed when carbon dioxide dissolves in rainwater? | Carbonic acid |
