Practice Dojo
AP Chemistry practice
Free, original practice questions for the AP Chemistry exam, written to the College Board Course and Exam Description.
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1,620multiple-choice questions
9units, 3 difficulty levels each
60question exam mix
45free-response questions (18 long, 27 short)
How the practice works
Each unit has three multiple-choice sets. White belt covers core terms and foundational ideas. Regular is set at exam level, with concept checks and applications. Black belt has harder, multi-step questions. After each answer you get an explanation, plus a "Still don't get it?" walkthrough with the key idea, a worked solution, a short practice problem and the most common wrong answer.
The exam mix draws questions from every unit in proportion to the exam's unit weights, so you can practice the whole course in one sitting.
Free-response questions come with point-by-point scoring rubrics in the style of College Board scoring guidelines, model answers that earn every point, and walkthroughs for each part.
No account is needed. Your progress is saved in your own browser.
Units and topics
Unit 1: Atomic Structure and Properties
7 to 9% of the exam · 180 multiple-choice questions · 5 free-response questions
- 1.1 Moles and Molar Mass
- 1.2 Mass Spectroscopy of Elements
- 1.3 Elemental Composition of Pure Substances
- 1.4 Composition of Mixtures
- 1.5 Atomic Structure and Electron Configuration
- 1.6 Photoelectron Spectroscopy
- 1.7 Periodic Trends
- 1.8 Valence Electrons and Ionic Compounds
Unit 2: Compound Structure and Properties
7 to 9% of the exam · 180 multiple-choice questions · 5 free-response questions
- 2.1 Types of Chemical Bonds
- 2.2 Intramolecular Force and Potential Energy
- 2.3 Structure of Ionic Solids
- 2.4 Structure of Metals and Alloys
- 2.5 Lewis Diagrams
- 2.6 Resonance and Formal Charge
- 2.7 VSEPR and Bond Hybridization
Unit 3: Properties of Substances and Mixtures
18 to 22% of the exam · 180 multiple-choice questions · 5 free-response questions
- 3.1 Intermolecular and Interparticle Forces
- 3.2 Properties of Solids
- 3.3 Solids, Liquids, and Gases
- 3.4 Ideal Gas Law
- 3.5 Kinetic Molecular Theory
- 3.6 Deviation from Ideal Gas Law
- 3.7 Solutions and Mixtures
- 3.8 Representations of Solutions
- 3.9 Separation of Solutions and Mixtures
- 3.10 Solubility
- 3.11 Spectroscopy and the Electromagnetic Spectrum
- 3.12 Properties of Photons
- 3.13 Beer-Lambert Law
Unit 4: Chemical Reactions
7 to 9% of the exam · 180 multiple-choice questions · 5 free-response questions
- 4.1 Introduction for Reactions
- 4.2 Net Ionic Equations
- 4.3 Representations of Reactions
- 4.4 Physical and Chemical Changes
- 4.5 Stoichiometry
- 4.6 Introduction to Titration
- 4.7 Types of Chemical Reactions
- 4.8 Introduction to Acid-Base Reactions
- 4.9 Oxidation-Reduction (Redox) Reactions
Unit 5: Kinetics
7 to 9% of the exam · 180 multiple-choice questions · 5 free-response questions
- 5.1 Reaction Rates
- 5.2 Introduction to Rate Law
- 5.3 Concentration Changes Over Time
- 5.4 Elementary Reactions
- 5.5 Collision Model
- 5.6 Reaction Energy Profile
- 5.7 Introduction to Reaction Mechanisms
- 5.8 Reaction Mechanism and Rate Law
- 5.9 Pre-Equilibrium Approximation
- 5.10 Multistep Reaction Energy Profile
- 5.11 Catalysis
Unit 6: Thermochemistry
7 to 9% of the exam · 180 multiple-choice questions · 5 free-response questions
- 6.1 Endothermic and Exothermic Processes
- 6.2 Energy Diagrams
- 6.3 Heat Transfer and Thermal Equilibrium
- 6.4 Heat Capacity and Calorimetry
- 6.5 Energy of Phase Changes
- 6.6 Introduction to Enthalpy of Reaction
- 6.7 Bond Enthalpies
- 6.8 Enthalpy of Formation
- 6.9 Hess's Law
Unit 7: Equilibrium
7 to 9% of the exam · 180 multiple-choice questions · 5 free-response questions
- 7.1 Introduction to Equilibrium
- 7.2 Direction of Reversible Reactions
- 7.3 Reaction Quotient and Equilibrium Constant
- 7.4 Calculating the Equilibrium Constant
- 7.5 Magnitude of the Equilibrium Constant
- 7.6 Properties of the Equilibrium Constant
- 7.7 Calculating Equilibrium Concentrations
- 7.8 Representations of Equilibrium
- 7.9 Introduction to Le Chatelier's Principle
- 7.10 Reaction Quotient and Le Chatelier's Principle
- 7.11 Introduction to Solubility Equilibria
- 7.12 Common-Ion Effect
Unit 8: Acids and Bases
11 to 15% of the exam · 180 multiple-choice questions · 5 free-response questions
- 8.1 Introduction to Acids and Bases
- 8.2 pH and pOH of Strong Acids and Bases
- 8.3 Weak Acid and Base Equilibria
- 8.4 Acid-Base Reactions and Buffers
- 8.5 Acid-Base Titrations
- 8.6 Molecular Structure of Acids and Bases
- 8.7 pH and pKa
- 8.8 Properties of Buffers
- 8.9 Henderson-Hasselbalch Equation
- 8.10 Buffer Capacity
- 8.11 pH and Solubility
Unit 9: Thermodynamics and Electrochemistry
7 to 9% of the exam · 180 multiple-choice questions · 5 free-response questions
- 9.1 Introduction to Entropy
- 9.2 Absolute Entropy and Entropy Change
- 9.3 Gibbs Free Energy and Thermodynamic Favorability
- 9.4 Thermodynamic and Kinetic Control
- 9.5 Free Energy and Equilibrium
- 9.6 Free Energy of Dissolution
- 9.7 Coupled Reactions
- 9.8 Galvanic (Voltaic) and Electrolytic Cells
- 9.9 Cell Potential and Free Energy
- 9.10 Cell Potential Under Nonstandard Conditions
- 9.11 Electrolysis and Faraday's Law
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