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2. How do you test for sulfate ions?

  • Add dilute hydrochloric acid, followed by barium chloride solution, if white precipitate formed(barium sulfate) then yes
  • Add dilute nitric acid, followed by barium chloride solution, if white precipitate formed(barium sulfate) then yes
  • Add dAdd barium chloride solution, followed by dilute hydrochloric acid, if white precipitate formed(barium sulfate) then yes
  • Add dilute sulfuric acid, followed by barium chloride solution, if white precipitate formed(barium sulfate) then yes

3. A scaled kettle will mean what?

  • Your teeth will be in better condition
  • The water takes longer and more energy to boil- the scale acts as a thermal insulator
  • You are less likely to develope certain diseases
  • The kettle will stop working immediately

4. Which dissolved ions cause hardness in water?

  • Fluorine and Calcium
  • Calcium and Magnesium
  • Magnesium and Aluminium
  • Aluminium and Fluorine

5. When inner electrons get in the way of the nuclear charge, weakening the attraction, this is called...?

  • Sheilding
  • Blocking
  • Neautralising
  • Counteracting
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