AP Chemistry, one topic at a time

AP Chemistry score calculator: enter your section results and see an estimated 1–5 score.

1. Unit 1 · 7–9%

   Atomic Structure and Properties

   Moles and Molar Mass · Mass Spectra of Elements · Elemental Composition of Pure Substances · Composition of Mixtures · Atomic Structure and Electron Configuration · Photoelectron Spectroscopy · Periodic Trends · Valence Electrons and Ionic Compounds

2. Unit 2 · 7–9%

   Compound Structure and Properties

   Types of Chemical Bonds · Intramolecular Force and Potential Energy · Structure of Ionic Solids · Structure of Metals and Alloys · Lewis Diagrams · Resonance and Formal Charge · VSEPR and Hybridization

3. Unit 3 · 18–22%

   Properties of Substances and Mixtures

   Intermolecular and Interparticle Forces · Properties of Solids · Solids, Liquids, and Gases · Ideal Gas Law · Kinetic Molecular Theory · Deviation from Ideal Gas Law · Solutions and Mixtures · Representations of Solutions · Separation of Solutions and Mixtures · Solubility · Spectroscopy and the Electromagnetic Spectrum · Properties of Photons · Beer-Lambert Law

4. Unit 4 · 7–9%

   Chemical Reactions

   Introduction for Reactions · Net Ionic Equations · Representations of Reactions · Physical and Chemical Changes · Stoichiometry · Introduction to Titration · Types of Chemical Reactions · Introduction to Acid-Base Reactions · Oxidation-Reduction (Redox) Reactions

5. Unit 5 · 7–9%

   Kinetics

   Reaction Rates · Introduction to Rate Law · Concentration Changes Over Time · Elementary Reactions · Collision Model · Reaction Energy Profile · Introduction to Reaction Mechanisms · Reaction Mechanism and Rate Law · Pre-Equilibrium Approximation · Multistep Reaction Energy Profile · Catalysis

6. Unit 6 · 7–9%

   Thermochemistry

   Endothermic and Exothermic Processes · Energy Diagrams · Heat Transfer and Thermal Equilibrium · Heat Capacity and Calorimetry · Energy of Phase Changes · Introduction to Enthalpy of Reaction · Bond Enthalpies · Enthalpy of Formation · Hess’s Law

7. Unit 7 · 7–9%

   Equilibrium

   Introduction to Equilibrium · Direction of Reversible Reactions · Reaction Quotient and Equilibrium Constant · Calculating the Equilibrium Constant · Magnitude of the Equilibrium Constant · Properties of the Equilibrium Constant · Calculating Equilibrium Concentrations · Representations of Equilibrium · Introduction to Le Châtelier’s Principle · Reaction Quotient and Le Châtelier’s Principle · Introduction to Solubility Equilibria · Common-Ion Effect

8. Unit 8 · 11–15%

   Acids and Bases

   Introduction to Acids and Bases · pH and pOH of Strong Acids and Bases · Weak Acid and Base Equilibria · Acid-Base Reactions and Buffers · Acid-Base Titrations · Molecular Structure of Acids and Bases · pH and pKa · Properties of Buffers · Henderson-Hasselbalch Equation · Buffer Capacity · pH and Solubility

9. Unit 9 · 7–9%

   Thermodynamics and Electrochemistry

   Introduction to Entropy · Absolute Entropy and Entropy Change · Gibbs Free Energy and Thermodynamic Favorability · Thermodynamic and Kinetic Control · Free Energy and Equilibrium · Free Energy of Dissolution · Coupled Reactions · Galvanic (Voltaic) and Electrolytic Cells · Cell Potential and Free Energy · Cell Potential Under Nonstandard Conditions · Electrolysis and Faraday’s Law

• A lesson for every topic

  Each one explains a single idea step by step, then checks it with a few questions.

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  Mock exams and a predicted score

  Same sections, time limits and calculator rules as the May exam. Every set and mock updates your predicted 1 to 5.