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
A metallurgy lab compares three operations. Sample P is a sulphide ore heated in excess air. Sample Q is a carbonate ore heated in limited air. Sample R is impure copper purified using an electrolytic cell.
Total: 4 marks
(a) Name the process for P. (1 mark)
(b) Name the process for Q. (1 mark)
(c) In R, which electrode is made of impure copper? (1 mark)
(d) What collects below the anode during copper electrorefining? (1 mark)
Something wrong with this item?