Chemistry

Chemistry Working For Us- hard and soft water

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1. Define Water

  • Water is a liquid and many compounds cannot dissolve in it
  • Water is a solid
  • Water is a solvent and mnay compounds can dissolve in it
  • Water is not a solvent
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2. What determines whether whether it is hard or soft?

  • The solubility
  • The amount of compounds present in the water
  • The temperature
  • The type of compounds present in the water
  • The colour

3. Most hard water contains what?

  • Citric Acid
  • Sulphur
  • Nitrogen
  • Calcium or magnesium compounds
  • Aluminium

4. What do calcium and magnesium compounds do?

  • dissolve in natural water that flows over ground or rocks containing compounds of these elements
  • dissolve in water which flows in the sea
  • Change the colour of the water

5. Soft water does not contain many dissolved compounds

  • True
  • False
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