When is an ionic compound able to conduct electricity?
In solution and in the solid state
In the solid and liquid states
In solution and in the liquid state
To which electrode are metal ions attracted?
Cathode
Anode
Positive electrode
To which electrode are the cations attracted?
Why must aluminium oxide be heated during the extraction of aluminium?
To melt the aluminium
To allow ions to move during electrolysis
To make the oxygen react with carbon
What is produced at the carbon anode during the electrolysis of aluminium oxide?
Carbon dioxide
Oxygen
Aluminium
During the electrolysis of concentrated sodium chloride solution, what is formed at the anode?
Sodium
Hydrogen
Chlorine
During the electrolysis of copper(II) sulfate solution, what is formed at the cathode?
Copper
Which half equation is correctly balanced?
Pb2+ + e– \(\rightarrow\) Pb
Pb2+ + 2e– \(\rightarrow\) Pb
Pb2+ + 2e– \(\rightarrow\) 2Pb
What happens to a cation at the negative electrode?
It gains electrons and is reduced
It gains electrons and is oxidised
It loses electrons and is oxidised
During the electrolysis of molten lead(II) bromide, which ion is oxidised?
Pb2-
Pb2+
Br-