Short answer·Routine exam skill (2/5)·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
Explain the cleansing action of soap using the micelle figure.
Total: 2 marks
(a) State how the tail and head of soap orient around grease. (1 mark)
(b) Explain how this helps remove grease in water. (1 mark)
Something wrong with this item?