Case study·Hard exam skill (4/5)·No calculator
Difficulty guide
The label describes the problem, not your ability.
1/5 - Foundational
Warm-up setup; checks one basic idea.
2/5 - Routine exam skill
Normal syllabus skill; usually one main rule or interpretation.
3/5 - Standard multi-step
Exam-style problem with multiple steps or a common trap.
4/5 - Hard exam skill
High-end exam problem; combines methods carefully.
5/5 - Challenge
Stretch problem beyond normal exam pressure.
Question
Three electrolytic cells are connected in series, containing , and acidified water respectively. The same charge passes through all cells.
Total: 4 marks
(a) If electrons pass, find moles of silver deposited. (1 mark)
(b) Find moles of copper deposited. (1 mark)
(c) Find moles of hydrogen gas liberated. (1 mark)
(d) Explain why the three amounts are not equal. (1 mark)
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