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 sealed vessel contains . Formation of is exothermic. A student tries four changes: adding , raising temperature, compressing the vessel, and adding catalyst.
Total: 5 marks
(a) Effect of adding on product amount. (1 mark)
(b) Effect of raising temperature on product amount. (1 mark)
(c) Effect of compression on product amount. (2 marks)
(d) Effect of catalyst on equilibrium amount. (1 mark)
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