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2 marksOxidation – Reduction Reactions

CSEC Chemistry · May/June 2019 · Paper 2 · Question 6(b)(iii)

The student recorded the following observations from the reaction between the iron and copper sulfate solution: Observations: Reddish-brown solid coating formed on the iron strip. Blue colour of the solution changed to dirty green.

Account for the observations made from the reaction between the iron and copper sulfate solution.

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Other parts of this question

  1. 6(a)(i)Define the term 'alloy'.[1 mark]
  2. 6(a)(ii)Name ONE alloy of aluminium and state its use based on one of its enhanced properties.[3 marks]
  3. 6(b)(i)State which of the TWO metals is more reactive: Fe or Zn. Give a reason for your answer.[2 marks]
  4. 6(b)(ii)Using the data in Table 3 on page 22, deduce the order of reactivity of the four metals Cu, Fe, Zn and Pb, from the most reactive to the least reactive metal.[2 marks]
  5. 6(b)(iv)Write the ionic equation, including state symbols, for the reaction between the iron and copper sulfate solution.[2 marks]
  6. 6(c)(i)Identify which of the metals used in the experiment in (b) is MOST hazardous to the environment.[1 mark]
  7. 6(c)(ii)State TWO harmful effects of continuous exposure to the metal identified in (c)(i) on human beings.[2 marks]

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