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
The diagram shows a pure solvent and a solution separated by a semipermeable membrane. A student observes a rise in the liquid level on the solution side.
Total: 4 marks
(a) Name the process responsible for the level rise. (1 mark)
(b) State why the solution side rises. (1 mark)
(c) What must be done to produce reverse osmosis? (1 mark)
(d) Calculate the minimum pressure needed to reverse osmosis for a sucrose solution at . Use . (1 mark)
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