Passing electricity through compounds: electrolysis
3 marks · EasyThe table shows the roles of electrodes and ions in electrolysis of sodium bromide solution.
| Part | Type | Charge |
|---|---|---|
| Electrode A | ||
| Electrode B | ||
| Na^+ ion | ||
| Br^- ion |
Complete the table by naming the type (anode/cathode/cation/anion) and the charge (+/–) for each part.
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.
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(b) Electrode A: Anode, +; Electrode B: Cathode, –; Na^+ ion: Cation, +; Br^– ion: Anion, – · must show All 4 completed correctly
Common mistakes: Mixing up anode/cathode or cation/anion; Mixing up charges
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Marking points
B1 (b) · 1 mark · Correctly identifies the type for each part (anode/cathode/cation/anion).
B1 (b) · 1 mark · Correctly identifies the charge for each part (+/–).
B1 (b) · 1 mark · All four parts completed correctly (no confusions or mismatches).
Worked solution
| Part | Type | Charge |
|---|---|---|
| Electrode A | Anode | + |
| Electrode B | Cathode | – |
| Na^+ ion | Cation | + |
| Br^- ion | Anion | – |