Topic 12 - Corrosion

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  1. What is corrosion?
    A chemical reaction that occurs on the surface of metals
  2. When a metal corrodes the _____ of the metal joins with atoms of another element to form a compound?
    surface
  3. Different metals corrode at different...?
    rates
  4. What does iron need before it corrodes?
    Water and oxygen
  5. What is the corrosion of iron called?
    rusting
  6. When iron corrodes its atoms lose two ______ to form iron (II) ions?
    electrons
  7. The iron (II) ions will then lose another electron to form _____ ions?
    Fe3+
  8. What kind of reaction is the corrosion or rusting of iron?
    Oxidation
  9. The electrons lost by the iron atoms are gained by oxygen and hydrogen to form....?
    hydroxide ions
  10. What colour does ferroxyl indicator turn in the presence of iron (II) ions?
    Blue
  11. What colour does ferroxyl indicator turn in the presence of hydroxide ions?
    pink
  12. Why does salt increase the rate of corrosion?
    As it contains ions and acts as an electrolyte
  13. What is electroplating?
    Coating a metal with a layer of another metal by electrolysis
  14. What is galvanising?
    Coating iron objects with a layer of zinc
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Topic 12 - Corrosion
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Standard Grade Chemistry - Topic 12 - Corrosion
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