Entropy Gibbs energy quiz for A Level chemistry: 10 questions with answers

by aicko
28 October 2026

Quick answer: Entropy measures how many ways particles and energy can be arranged; it rises from solid to liquid to gas. This Chemistry 11-12 quiz checks entropy Gibbs energy with 10 multiple-choice questions and instant feedback; every answer comes with a short explanation.

Entropy Gibbs energy quiz for A Level chemistry: 10 questions with answers

Ten multiple-choice questions on entropy, the Gibbs equation, feasibility and the link between ΔG and K. Choose one option for each, then read the explanation to see the typical error behind each wrong answer.

Level: Chemistry grades 11-12 (A Level · IB · Class 11-12) · Curriculum: IB R1.4

Which has the highest standard molar entropy at 298 K?

What is the sign of ΔS for 2SO₂(g) + O₂(g) → 2SO₃(g)?

What is the correct form of the Gibbs equation?

A reaction has ΔG = −8 kJ/mol. What does this mean?

Calculate ΔG: ΔH = +40 kJ/mol, ΔS = +100 J K⁻¹ mol⁻¹, T = 298 K.

When is a reaction with ΔH > 0 and ΔS > 0 spontaneous?

What is ΔG at the melting point of a solid?

Which statement about ΔS(surroundings) is correct?

What does a large negative ΔG° imply about K?

Which temperature must be used in ΔG = ΔH − TΔS?

Gibbs equation? — ΔG = ΔH − TΔS

Spontaneous reaction has what ΔG? — Negative.

ΔS° of a reaction formula? — ΣS°(products) − ΣS°(reactants)

Entropy units? — J K⁻¹ mol⁻¹

ΔS(surroundings) formula? — −ΔH / T

ΔG at equilibrium? — Zero.

Crossover temperature formula? — T = ΔH / ΔS

Relation between ΔG° and K? — ΔG° = −RT ln K

Which state has highest entropy? — Gas.

ΔH negative, ΔS negative: when spontaneous? — At low temperatures only.

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