greenchloe1998
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Quiz on hard water quiz, created by greenchloe1998 on 01/02/2015.

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greenchloe1998
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hard water quiz

Question 1 of 10

1

find the relative formula mass (Mr) of water. ( H20)

Select one of the following:

  • 18

  • 24

  • 36

  • 72

Explanation

Question 2 of 10

1

calculate the percentage of nitrogen in NH3.

Select one of the following:

  • 82.4

  • 78

  • 34.6

Explanation

Question 3 of 10

1

The moles of an element = mass of that element/ the relative atomic mass of that element. Sarah has 48 grams of magnesium, she believes she has two moles, is she right?

Select one of the following:

  • True
  • False

Explanation

Question 4 of 10

1

What are the advantages of hard water?

Select one or more of the following:

  • Prevention of heart disease.

  • it makes you feel happy

  • it contains minerals which may be good for your health.

Explanation

Question 5 of 10

1

If I add soap to water and it easily forms a lather, is it hard or soft water?

Select one of the following:

  • Hard water

  • Soft water

Explanation

Question 6 of 10

1

Which compounds are dissolved into temporary hard water?

Select one of the following:

  • Magnesium hydrogen carbonate and Calcium hydrogen carbonate.

  • Magnesium sulfate and calcium sulfate.

Explanation

Question 7 of 10

1

when boiling temporary hard water, what is the product it forms?

Select one of the following:

  • rust

  • limescale

  • nasty worms

Explanation

Question 8 of 10

1

Name the disadvantages of hard water.

Select one or more of the following:

  • more soap is needed to form a suitable lather.

  • It is bad for your eyes

  • it produces scum which is difficult to clean

  • Hard water cannot be used for industrial processes like dying materials.

Explanation

Question 9 of 10

1

Advantages of hard water. ( choose 3)

Select one or more of the following:

  • calcium helps growth of healthy bones and teeth.

  • magnesium helps an effective metabolism

  • less likely to suffer from heart disease.

  • the chemicals within it make you happier

  • it will help you succeed in your life.

Explanation

Question 10 of 10

1

calcium + sodium carbonate forms what?

Select one of the following:

  • soluble sodium ions + Calcium carbonate (limescale)

  • calcium stearate.

Explanation

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