Harry Woodhall
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A quick quiz on everything outlined in the C3.2 specification.

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Harry Woodhall
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C3.2 - Everything in the Specification

C3.2 - Everything in the Specification

Frage 1 von 9

1

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water forms a with soap; water reacts to form with soap and so more soap is needed to form a . This makes using water moves .

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Frage 2 von 9

1

What are the two ions in hard water that react with soap to form scum?

Wähle eine der folgenden:

  • Calcium and magnesium ions.

  • Calcium and hydrogen ions.

  • Hydrogen and magnesium ions.

  • Magnesium and sulphur ions.

  • Calcium and sulphur ions.

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Frage 3 von 9

1

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water, when , also forms on the insides of pipes, boilers and . A build-up of scale reduces the of heating systems, and so using water is more .

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Frage 4 von 9

1

Fülle die Lücken, um den Text zu vervollständigen.

water, when , also forms on the insides of pipes, boilers and . A build-up of reduces the efficiency of systems because the is a insulator. For example, a kettle with on the heating element takes longer to boil, and so using water is more .

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Frage 5 von 9

1

What is the main compound that forms scale?

Wähle eine oder mehr der folgenden:

  • Calcium carbonate.

  • Magnesium carbonate.

  • Copper carbonate.

  • Hydrogen flouride.

  • Sodium fluoride.

  • Ammonia.

  • Calcium sulphate.

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Frage 6 von 9

1

Give two benefits of hard water.

Wähle eine oder mehr der folgenden:

  • The calcium ions in hard water are good for the development and maintenance of teeth and bones.

  • The calcium ions in hard water help to reduce heart disease.

  • The calcium ions in hard water help to reinforce tissue.

  • The calcium ions in hard water help to strengthen the arteries in the circulatory system.

  • The magnesium ions in hard water help absorb nutrients from the bloodstream.

  • The magnesium ions in hard water help absorb nutrients from the digestive system.

  • The magnesium ions in hard water help to reduce heart disease.

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Frage 7 von 9

1

Fülle die Lücken, um den Text zu vervollständigen.

There are two kinds of water hardness - and .

hardness is caused by the ion, HCO₃.
hardness is caused by dissolved , CaSO₄.

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Frage 8 von 9

1

Which of the following water softening methods only apply to temporary hard water?

Wähle eine der folgenden:

  • Using an ion exchanger.

  • Using washing soda.

  • Boiling the water.

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Frage 9 von 9

1

Fülle die Lücken, um den Text zu vervollständigen.

Fill in the blanks to complete the following passages about how hard water can be made soft.

METHOD 1 - hardness can be removed by . When heated, the calcium decomposes to form calcium , which is the that affects heating systems. This method does not apply to hard water.

METHOD 2 - Both types of hardness can be removed by adding ( , or Na₂CO₃) to the water. The reacts with the calcium and ions to form an precipitate of calcium and magnesium . The ions are no longer 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 ' ' columns. The columns have lots of (or hydrogen) ions, and '' them for calcium or ions in the water.

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