1
Q
Lead bromide is …. So must Be….
A
Insoluble
Molten
2
Q
2 half equations of electrolysis of lead bromide
A
Pb2+ + 2e- -> pb
2br- -> br2 + 2e-
3
Q
Cryolite is added to aluminium to
A
Lower the melting point
4
Q
Products of electrolysis of aluminium
A
Liquid aluminium
Oxygen gas
5
Q
Electrodes used in aluminium electrolysis?
Why must the be replaced
A
Carbon electrodes
React with oxygen and make carbon dioxide
6
Q
Brine contains what ions
A
Na+
Cl-
H+
OH-
7
Q
In electrolysis of brine water is formed at the positive electrode
A
Chlorine
8
Q
In electrolysis what us firmed at negative ion and why
A
Hydrogen
Sodium is more reactive than hydrogen
9
Q
Products of electrolysis of brine (3)
A
Hydrogen
Chlorine
Sodium hydroxide solution
