Chemical equilibrium quiz, Chemistry grades 11-12 (free)

Quick answer: Chemical equilibrium is reached when forward and reverse reactions occur at the same rate, so concentrations stay constant. This Chemistry 11-12 quiz checks chemical equilibrium with 10 multiple-choice questions and instant feedback; every answer comes with a short explanation.

Chemical equilibrium quiz for A Level chemistry: 10 questions with answers

This chemical equilibrium quiz for chemistry grades 11-12 has quick multiple-choice questions with instant feedback. Need a refresher first? Read the lesson or do the worksheet on chemical equilibrium.

Choose the best answer for each question. The explanations show the idea behind the correct option and the error behind each wrong one.

Level: Chemistry grades 11-12 (A Level · IB · Class 11-12) · Curriculum: IB R2.3

Contents

Chemical equilibrium quiz: the questions

What is true of a system at dynamic equilibrium?

What is the Kc expression for N₂(g) + 3H₂(g) ⇌ 2NH₃(g)?

Which species is left out of the Kc expression for CaCO₃(s) ⇌ CaO(s) + CO₂(g)?

Which change alters the value of Kc?

Kp for 2NO₂ ⇌ N₂O₄ with p(NO₂) = 10 kPa and p(N₂O₄) = 20 kPa is

The forward reaction is exothermic. What happens to K when the temperature rises?

For N₂(g) + 3H₂(g) ⇌ 2NH₃(g), what does a pressure increase do?

Q is greater than K. In which direction does the reaction shift?

A large Kc (about 10⁵) means that at equilibrium

Adding a catalyst to a system at equilibrium

Define dynamic equilibrium. — Forward and reverse rates equal; concentrations constant.

Kc for aA + bB ⇌ cC + dD? — [C]^c[D]^d / ([A]^a[B]^b)

Which substances are omitted from Kc? — Pure solids and pure liquids.

What alone changes the value of K? — Temperature.

Kp uses what quantities? — Partial pressures of gases.

Partial pressure formula? — p = mole fraction × total pressure

Large K (above 10³) means? — Equilibrium mixture mostly products.

Q less than K: which way does it shift? — To the right (forward).

Effect of a catalyst on K? — None; equilibrium is reached sooner.

Exothermic forward reaction, raise T: K? — K decreases.

Chemical equilibrium quiz for A Level chemistry: 10 questions with answers

Chemical equilibrium quiz: the questions