Question 3
FA student electrolyses copper chloride solution using two carbon electrodes.
The diagram shows the apparatus.
a.[4]
Complete the sentences.
Use words from the list: anode, cathode, chloride, chlorine, copper, hydrogen
A pink-brown solid forms on the ...... . This solid is ...... . Bubbles of a pale green gas form at the ...... . This gas is ...... .
b.[2]
The gas made at the anode is toxic.
Suggest one safety precaution the student should take. Explain why.
c.[1]
Copper ions are positive.
Explain why the copper forms at the electrode you named in (a).
d.[1]
The student wants to collect a sample of the gas made at the anode.
Suggest how the student could do this.
3.4 Electrolysis Questions
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.