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1 markImpact of Metals on Living Systems and the Environment

CSEC Chemistry · January 2020 · Paper 2 · Question 6(a)(iii)

Metals corrode under certain conditions. Figure 2 shows an experiment with iron nails exposed to different conditions in test tubes A, B, and C.

Suggest the reason why the boiled water was covered with oil in Test tube B.

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Other parts of this question

  1. 6(a)(i)State the TWO conditions necessary for the corrosion of a metal.[2 marks]
  2. 6(a)(ii)State whether corrosion will occur for EACH of the test tubes shown in Figure 2. Give ONE reason to support your answer in EACH case. Test tube A, Test tube B,…[6 marks]
  3. 6(b)(i)State ONE alloy of aluminium and its use.[2 marks]
  4. 6(b)(ii)Explain why the corrosion of aluminium is beneficial.[2 marks]
  5. 6(b)(iii)Write a balanced equation to show the product formed when aluminium is left exposed to air.[2 marks]

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