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 display compares four materials: a soft polythene bag, a hard electrical switch made from Bakelite, a nylon rope, and a PHBV sample used for a biodegradable article.
Total: 4 marks
(a) Which material is a thermosetting polymer? (1 mark)
(b) Which material contains amide linkages? (1 mark)
(c) Which material is chosen for biodegradability? (1 mark)
(d) Why is the soft polythene bag not the same structural type as Bakelite? (1 mark)
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