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 mixture contains sand, common salt and ammonium chloride. Plan a sequence to separate all three components.
Total: 4 marks
(a) State the first separation step and the component removed. (1 mark)
(b) State how you separate sand from common salt. (2 marks)
(c) State how common salt is finally recovered. (1 mark)
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