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