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C3.2 - Everything in the Specification

Harry Woodhall 9 questions

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Questions in this quiz (9)

  1. 1[blank_start]Soft[blank_end] water forms a [blank_start]lather[blank_end] with soap; [blank_start]hard[blank_end] water reacts to form [blank_start]scum[blank_end] with soap and so more soap is needed to form a [blank_start]lather[blank_end]. This makes using [blank_start]hard[blank_end] water moves [blank_start]expensive[blank_end].
    1. ASoft
    2. Blather
    3. Chard
    4. Dscum
    5. Elather
    6. Fhard
    7. Gexpensive
  2. 2What are the two ions in hard water that react with soap to form scum?
    1. ACalcium and magnesium ions.
    2. BCalcium and hydrogen ions.
    3. CHydrogen and magnesium ions.
    4. DMagnesium and sulphur ions.
    5. ECalcium and sulphur ions.
  3. 3[blank_start]Hard[blank_end] water, when [blank_start]heated[blank_end], also forms [blank_start]scale[blank_end] on the insides of pipes, boilers and [blank_start]kettles[blank_end]. A build-up of scale reduces the [blank_start]efficiency[blank_end] of heating systems, and so using [blank_start]hard[blank_end] water is more [blank_start]expensive[blank_end].
    1. AHard
    2. Bheated
    3. Cscale
    4. Dkettles
    5. Eefficiency
    6. Fhard
    7. Gexpensive
  4. 4[blank_start]Hard[blank_end] water, when [blank_start]heated[blank_end], also forms [blank_start]scale[blank_end] on the insides of pipes, boilers and [blank_start]kettles[blank_end]. A build-up of [blank_start]scale[blank_end] reduces the efficiency of [blank_start]heating[blank_end] systems because the [blank_start]scale[blank_end] is a [blank_start]thermal[blank_end] insulator. For example, a kettle with [blank_start]scale[blank_end] on the heating element takes longer to boil, and so using [blank_start]hard[blank_end] water is more [blank_start]expensive[blank_end].
    1. AHard
    2. Bheated
    3. Cscale
    4. Dscale
    5. Escale
    6. Fscale
    7. Gthermal
    8. Hkettles
    9. Iheating
    10. Jhard
    11. Kexpensive
  5. 5What is the main compound that forms scale?
    1. ACalcium carbonate.
    2. BMagnesium carbonate.
    3. CCopper carbonate.
    4. DHydrogen flouride.
    5. ESodium fluoride.
    6. FAmmonia.
    7. GCalcium sulphate.
  6. 6Give two benefits of hard water.
    1. AThe calcium ions in hard water are good for the development and maintenance of teeth and bones.
    2. BThe calcium ions in hard water help to reduce heart disease.
    3. CThe calcium ions in hard water help to reinforce tissue.
    4. DThe calcium ions in hard water help to strengthen the arteries in the circulatory system.
    5. EThe magnesium ions in hard water help absorb nutrients from the bloodstream.
    6. FThe magnesium ions in hard water help absorb nutrients from the digestive system.
    7. GThe magnesium ions in hard water help to reduce heart disease.
  7. 7There are two kinds of water hardness - [blank_start]temporary[blank_end] and [blank_start]permanent[blank_end].

    [blank_start]Temporary[blank_end] hardness is caused by the [blank_start]hydrogencarbonate[blank_end] ion, HCO₃.
    [blank_start]Permanent[blank_end] hardness is caused by dissolved [blank_start]calcium[blank_end] [blank_start]sulphate[blank_end], CaSO₄.
    1. Atemporary
    2. Bpermanent
    3. CTemporary
    4. DPermanent
    5. Ehydrogencarbonate
    6. Fsulphate
    7. Gcalcium
  8. 8Which of the following water softening methods only apply to temporary hard water?
    1. AUsing an ion exchanger.
    2. BUsing washing soda.
    3. CBoiling the water.
  9. 9Fill in the blanks to complete the following passages about how hard water can be made soft.

    METHOD 1 - [blank_start]Temporary[blank_end] hardness can be removed by [blank_start]boiling[blank_end]. When heated, the calcium [blank_start]hydrogencarbonate[blank_end] decomposes to form calcium [blank_start]carbonate[blank_end], which is the [blank_start]scale[blank_end] that affects heating systems. This method does not apply to [blank_start]permanent[blank_end] hard water.

    METHOD 2 - Both types of hardness can be removed by adding [blank_start]washing[blank_end] [blank_start]soda[blank_end] ([blank_start]sodium[blank_end] [blank_start]carbonate[blank_end], or Na₂CO₃) to the water. The [blank_start]carbonate[blank_end] reacts with the calcium and [blank_start]magnesium[blank_end] ions to form an [blank_start]insoluble[blank_end] precipitate of calcium [blank_start]carbonate[blank_end] and magnesium [blank_start]carbonate[blank_end]. The ions are no longer [blank_start]dissolved[blank_end] in the water, so they are unable to make it hard.

    METHOD 3 - Both types of hardness can be removed by running the hard water through '[blank_start]ion[blank_end] [blank_start]exchange[blank_end]' columns. The columns have lots of [blank_start]sodium[blank_end] (or hydrogen) ions, and '[blank_start]exchange[blank_end]' them for calcium or [blank_start]magnesium[blank_end] ions in the water.
    1. ATemporary
    2. Bboiling
    3. Chydrogencarbonate
    4. Dcarbonate
    5. Escale
    6. Fpermanent
    7. Gwashing
    8. Hsoda
    9. Isodium
    10. Jcarbonate
    11. Kcarbonate
    12. Lmagnesium
    13. Minsoluble
    14. Ncarbonate
    15. Ocarbonate
    16. Pdissolved
    17. Qion
    18. Rexchange
    19. Ssodium
    20. Texchange
    21. Umagnesium

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Description
A quick quiz on everything outlined in the C3.2 specification.
Language
English
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