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4 marksMole Concept

CSEC Chemistry · January 2014 · Paper 2 · Question 2(b)(iv)

Figure 2 shows apparatus for electrolysing molten lead(II) bromide.

A current of 5 amperes is passed through the molten lead bromide for 5 minutes. Calculate the mass of lead that would be deposited. (RAM: Pb = 207; Faraday's constant, F = 96 500 C mol⁻¹)

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Other parts of this question

  1. 2(a)(i)Define the term 'electrolysis'.[2 marks]
  2. 2(a)(ii)State the type of anode that is used in the purification of copper.[1 mark]
  3. 2(b)(i)Which of the electrodes (Electrode 1 or Electrode 2) in the diagram is the cathode?[1 mark]
  4. 2(b)(ii)Write the formula of the ion that migrates towards the anode.[1 mark]
  5. 2(b)(iii)Write a balanced ionic equation for the reaction occurring at the cathode.[2 marks]
  6. 2(c)Explain the observations from BOTH experiments.[4 marks]

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