Revision of Water chapters
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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| Name the two elements water is made up of. | Hydrogen and Oxygen
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| Name the two scientific processes that occur during the water cycle that cause water vapour to be in the atmosphere. | Evaporation and Transpiration
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| Name the five stages of water treatment. | Screening, Settling, Filtration, Chlorination and Flouridation
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| Name the chemical added to water during the settling phase of water treatment. | Aluminium Sulphate
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| What is the purpose of the chlorination phase of water treatment? | Killing bacteria
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| What is the purpose of the fluoridation phase of water treatment? | To prevent tooth decay
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| What is the density of pure water? | 1.0 g/cm3
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| What happens the boiling point of water if you reduce the pressure? | It lowers
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| How do you test for the presence of water? | Cobalt Chloride Paper (Blue -> Pink) or Anhydrous Copper Sulphate (White -> Blue)
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| Name the process of separating water into its elements using electricity. | Electrolysis
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| Name the apparatus commonly used in the laboratory to demonstrate electrolysis. | Hoffmann Voltameter
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| Which gas collects over the positive electrode in electrolysis? | Oxygen
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| Why is a little acid added to the water during electrolysis? | To improve the conductivity of the water
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| What is hard water? | Water that does not easily form a lather with soap.
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| What causes hardness in water? | Dissolved Calcium and Magnesium Ions
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| Name two methods of removing hardness from water. | Boiling, Ion Exchange Resin or Distillation
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| List some advantages of hard water. | Good source of calcium for teeth and bones, Nicer taste, Good for brewing
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| List some disadvantages of hard water. | Blocks pipes, Leaves scale on kettles, Wastes soap, produces scum
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| What scientific process would you use to show water contains dissolved solids? | Evaporation
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