Long answer·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
Plan a project to compare the acidity of three fruit-juice samples using a simple titration method available in a school laboratory.
Total: 4 marks
(a) State the dependent variable to be measured. (1 mark)
(b) State two conditions to keep the comparison fair. (1 mark)
(c) State one safety or accuracy precaution. (1 mark)
(d) Suggest one table heading pair for recording data. (1 mark)
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