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
Plan a paper chromatography practical to show that black ink contains more than one colour.
Total: 5 marks
(a) Describe the setup and starting position of the ink spot. (2 marks)
(b) State two observations that would support the conclusion. (2 marks)
(c) Give one precaution. (1 mark)
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