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6. What water produces an insoluble solid called scale?
- Temporary hard water
- Permanent hard water
- Soft water
7. What dissolved ions make water hard?
- Magnesium and Fluoride
- Calcium and magnesium
- Calcium and carbonate
8. What is used to kill bacteria in a water filter?
9. What is used to kill microbes in drinking water?
10. What is flourosis?
- When your bones get brittle
- When your death fall out
- When your teeth enamel gets destroyed
11. Boiling can soften.....
- All hard water
- Temporary hard water
- Permanent hard water
12. Magnesium compounds reduce heart disease and help to develop strong bones and teeth. True or False
- False it is both magnesium and calcium ions which do this
- False it is just calcium ions
- True
13. To precipitate out the ions that cause hardness you need to add what?
- Sodium chloride
- Sodium carbonate
- Calcium chloride
14. When do hydrocarbonate ions decompose in water?
- On heating in all hard water
- On heating in temporary hard water
- On being in permanent hard water