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 reaction is performed in an insulated cup containing water. The water temperature rises from to .
Total: 4 marks
(a) Did the water absorb or release heat? (1 mark)
(b) Is the reaction exothermic or endothermic? (2 marks)
(c) What is the sign of for the reaction? (1 mark)
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