📝 Unit Tests

AP Chemistry Unit Tests

Pick a unit to drill it head-on. Each unit has 4 different test variations so you can keep retaking until you master it.

7–9% of exam

Unit 1: Atomic Structure & Properties

Moles, mass spectrometry, electron configuration, periodic trends.

12 questions · ~18 min

Pick a variation

7–9% of exam

Unit 2: Compound Structure & Bonding

Ionic, covalent, and metallic bonding; Lewis diagrams; VSEPR; hybridization.

12 questions · ~18 min

Pick a variation

18–22% of exam

Unit 3: Properties of Substances & Mixtures

Intermolecular forces, gases, solids, liquids, solutions, and chromatography.

12 questions · ~18 min

Pick a variation

7–9% of exam

Unit 4: Chemical Reactions

Balancing reactions, stoichiometry, types of reactions, and titrations.

12 questions · ~18 min

Pick a variation

7–9% of exam

Unit 5: Kinetics

Rate laws, reaction mechanisms, catalysts, and the Arrhenius equation.

12 questions · ~18 min

Pick a variation

7–9% of exam

Unit 6: Thermodynamics

Heat, enthalpy, calorimetry, Hess’s law, and entropy.

12 questions · ~18 min

Pick a variation

7–9% of exam

Unit 7: Equilibrium

Reaction quotient, Kc and Kp, Le Chatelier, ICE tables, and Ksp.

12 questions · ~18 min

Pick a variation

11–15% of exam

Unit 8: Acids & Bases

pH, Ka and Kb, buffers, titration curves, and polyprotic acids.

12 questions · ~18 min

Pick a variation

7–9% of exam

Unit 9: Applications of Thermodynamics & Electrochemistry

Spontaneity, Gibbs free energy, galvanic & electrolytic cells, and electrolysis.

12 questions · ~18 min

Pick a variation

How unit tests work

Focused on a single AP unit, between a single-topic quiz and the full diagnostic.
4 variations per unit — pick a fresh variation any time you retake.
Roughly 90 seconds per question — the same pacing as the AP exam.
You'll get a unit-level score, recommended topics to review, and a question-by-question explanation.

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