FRQ — Chemical Thermodynamics

Case study·Hard exam skill (4/5)·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 class compares two calorimetry experiments. In experiment A, a solution warms by

4.0\text{ K}

in a coffee-cup calorimeter. In experiment B, a bomb calorimeter warms by

2.0\text{ K}

after combustion.

Total: 5 marks

(a) Which experiment is closer to constant-pressure calorimetry? (1 mark)

(b) Which experiment measures heat at constant volume? (1 mark)

(d) State whether $q_p$ or $q_v$ is directly connected with $\Delta U$ . (2 marks)

Your response (optional — you can also work on paper)

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