Electrolysis and redox
3 marks · EasyTable 1 shows the electron profiles for three different reactions.
| Process | Type of Particle | Electron Change |
|---|---|---|
| W | Iron(III) ion | gains 3 electrons |
| X | Chloride ion | loses 1 electron |
| Y | Copper(II) ion | gains 2 electrons |
Identify the process (W, X or Y) that involves oxidation.
State what reduction means in terms of electron transfer.
Identify all processes (W, X or Y) that involve reduction.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
(a) X
(b) Reduction means gaining electrons.
(c) W and Y
Show mark scheme and worked solution
Marking points
B1 (a) · 1 mark · Identifies X as the process involving oxidation.
B1 (b) · 1 mark · Defines reduction as gaining electrons.
B1 (c) · 1 mark · Identifies W and Y as reduction.
Worked solution
a) X is oxidation because chloride ion loses electrons.
b) Reduction means gaining electrons.
c) W and Y both involve ions gaining electrons, which is reduction.