Case study·Standard multi-step (3/5)·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 school laboratory prepares ethanol by fermentation for a demonstration and stores methanol separately with a poison warning label.
Total: 3 marks
(a) Name the gas evolved during fermentation of sugars. (1 mark)
(b) Why is ethanol often denatured for industrial use? (1 mark)
(c) Why is methanol labelled highly poisonous? (1 mark)
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