Quelpr
3 marksElectrochemistry

CSEC Chemistry · January 2007 · Paper 2 · Question 2(b)(i)

As electrolysis proceeds, describe the changes expected to be observed.

As electrolysis proceeds, describe the changes expected to be observed at the cathode.

The mark scheme is shown once you've answered.

Practise this question

Other parts of this question

  1. 2(a)(i)In order to adapt the electrolytic cell in Figure 1 for the purification of copper, what material may be used as the cathode?[3 marks]
  2. 2(a)(ii)In order to adapt the electrolytic cell in Figure 1 for the purification of copper, what material may be used as the anode?[1 mark]
  3. 2(a)(iii)In order to adapt the electrolytic cell in Figure 1 for the purification of copper, what material may be used as the electrolyte?[1 mark]
  4. 2(b)(ii)As electrolysis proceeds, describe the changes expected to be observed at the anode.[1 mark]
  5. 2(b)(iii)As electrolysis proceeds, describe the changes expected to be observed in the electrolyte.[1 mark]
  6. 2(c)(i)Write half-equations for the reactions occurring at the cathode.[2 marks]
  7. 2(c)(ii)Write half-equations for the reactions occurring at the anode.[1 mark]
  8. 2(d)(i)Calculate the quantity of electricity passed in coulombs.[2 marks]
  9. 2(d)(ii)Calculate the mass of copper deposited. [Relative Atomic Mass of Cu = 64, Faraday's constant = 96500 coulombs][3 marks]
  10. 2(e)In addition to extraction of metal from their compounds, electrolytic processes are also widely used to protect metals from corrosion, as well as to make them…[2 marks]

More practice: the rest of this paper · more Electrochemistry questions · all CSEC Chemistry past papers