Electrolysis Test Revision

Question 1

In the electrolysis of solutions, what is produced at the cathode (negative electrode)?

Answer 1

If the metal is less reactive than hydrogen, the metal is produced.
If the metal is more reactive than hydrogen, hydrogen is produced.

Question 2

Name the products at the anode (positive electrode) and cathode (negative electrode)
during the electrolysis of ZnCl,(aq).

Answer 2

Anode (positive electrode) - chlorine
Cathode (negative electrode) - zinc

Question 3

Give a half equation to show the formation of oxygen at the anode (positive electrode)
during the electrolysis of a solution.

Answer 3

4OH → 0
2+ 2H20 + 4e

Question 4

Give a half equation to show the formation of hydrogen at the cathode (negative electrode) during the electrolysis of a solution.

Answer 4

2H*+ 2e → Hz

Question 5

In electrolysis, are positive ions attracted to the anode (positive electrode) or the cathode (negative electrode)?

Answer 5

The cathode (negative electrode)

Question 6

State the observation at the anode (positive electrode) and cathode (negative electrode) during the electrolysis of NaCl(aq).

Answer 6

Anode (positive electrode) - bubbles
Cathode (negative electrode) - bubbles

Question 7

What is produced at the anode (positive electrode) and cathode (negative electrode) in the electrolysis of aluminium oxide?

Answer 7

Anode (positive electrode) - oxygen
Cathode (negative electrode) - aluminium

Question 8

Explain why the electrodes in electrolysis should be inert.

Answer 8

So they do not react with the electrolytes.