Long answer·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
A student studies the variation of cell potential in by changing electrolyte concentrations.
Total: 4 marks
(a) Write the cell reaction. (1 mark)
(b) State the role of the salt bridge. (1 mark)
(c) Predict the effect of decreasing concentration on cell potential. (1 mark)
(d) State one variable that should be kept constant for fair comparison. (1 mark)
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