Skip to content

Course home

Electrolysis

Electrolysis

EasyMedium
123456789101112131415161718
Question 4

Two separate electrolysis experiments are carried out using aqueous copper(II) sulfate, CuSO4(aq)\text{CuSO}_4(\text{aq})CuSO4​(aq), as the electrolyte.

  • Experiment X is performed using inert graphite electrodes.
  • Experiment Y is performed using active copper electrodes.

Which option correctly describes both the change in mass of the anode and the change in concentration of Cu2+(aq)\text{Cu}^{2+}(\text{aq})Cu2+(aq) ions in each experiment?

A

Experiment X: Anode mass stays the same; [Cu2+][\text{Cu}^{2+}][Cu2+] decreases.
Experiment Y: Anode mass decreases; [Cu2+][\text{Cu}^{2+}][Cu2+] stays the same.

B

Experiment X: Anode mass decreases; [Cu2+][\text{Cu}^{2+}][Cu2+] decreases.
Experiment Y: Anode mass decreases; [Cu2+][\text{Cu}^{2+}][Cu2+] decreases.

C

Experiment X: Anode mass stays the same; [Cu2+][\text{Cu}^{2+}][Cu2+] stays the same.
Experiment Y: Anode mass decreases; [Cu2+][\text{Cu}^{2+}][Cu2+] decreases.

D

Experiment X: Anode mass decreases; [Cu2+][\text{Cu}^{2+}][Cu2+] stays the same.
Experiment Y: Anode mass stays the same; [Cu2+][\text{Cu}^{2+}][Cu2+] stays the same.

Markscheme

Electrolysis Questions

  1. GCSE
  2. /Chemistry
  3. /Electrolysis

34 exam-style questions on OCR GCSE Chemistry Electrolysis. Each one has a worked solution and a mark scheme showing where the marks go.

Question bank