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3.4 Electrolysis

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Question 25
F

Copper(II) sulfate solution is electrolysed using two copper electrodes, P and Q. Each electrode has a mass of 10.00 g at the start.

For the first 20 minutes, P is the cathode. After 20 minutes, P has gained 0.30 g.

The connections to the power supply are then reversed, and electrolysis continues for another 20 minutes with the same current.

What are the masses of P and Q at the end?

[1]
A

P: 10.00 g; Q: 10.00 g

B

P: 10.30 g; Q: 9.70 g

C

P: 10.60 g; Q: 9.40 g

D

P: 9.70 g; Q: 10.30 g

Markscheme

3.4 Electrolysis Questions

  1. GCSE
  2. /Chemistry
  3. /3.4 Electrolysis

52 exam-style questions on OCR GCSE Chemistry 3.4 Electrolysis, covering 3.4.1 Products formed at the electrodes in electrolysis and 3.4.2 The technique of electrolysis. Each one has a worked solution and a mark scheme showing where the marks go.

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