Reaction-mechanism reasoning, equilibrium, and acid-base — the three FRQ pillars.
AP Chemistry FRQs reward students who can write a coherent mechanistic explanation, not just balance equations. Roughly half of the 7 FRQs every year touch equilibrium (Units 7-8) or acid-base (Unit 8), and we've structured our coverage so that buffer chemistry and Le Chatelier's principle get more practice problems than any other topic.
We also include a dedicated module on the 'particulate-level diagram' question type, which appears on nearly every recent FRQ section and asks students to redraw a molecular-level picture after a stated change. This is one of the highest-leverage skills for moving from a 3 to a 4.
Master AP Chemistry
245+ interactive lessons, diagnostic assessments, flashcards, daily questions, and competitive challenges — everything you need to score a 5.
Start here
Take the free AP Chemistry diagnostic
It finds what you already know and builds your study plan: the topics to clear first, each a short lesson plus an exit quiz.
Take the free diagnosticInteractive Lessons
Step-by-step lessons for every AP Chem unit with practice problems, molecular visualizations, and exit quizzes.
Diagnostic Test
Quick assessment across all AP Chem units to identify your strengths and weak areas with a personalized study plan.
Unit Tests
Drill a single AP unit at a time. 9 units · 4 different variations each — perfect for end-of-unit review.
Flashcards
Review chemical reactions, formulas, periodic trends, and key AP Chemistry vocabulary.
Competitive Mode
Challenge other students in real-time chemistry question battles. Climb the leaderboard.
Daily question
A fresh AP Chemistry question every day covering different units. Build consistency.
Exit Quizzes
Short assessments after each lesson to confirm understanding before moving on.
FRQ Practice
Practice free-response questions with auto-grading, rubrics, and timed exam simulation. 50% of the AP exam.
Full Practice Exam
Complete AP Chemistry exam simulation: 60 MCQ (90 min) + 7 FRQ (105 min) with scoring.
Full-Length Practice Exam (CB Format)
Alternate full exam in unified CB format: 45 MCQ (90 min) + 7 FRQ (105 min, 3 long + 4 short) with timed sections and self-graded rubrics.
Virtual Labs
Interactive simulations for titration curves and calorimetry experiments with real-time data.
Periodic Table
Interactive periodic table with trend visualization, element details, and AP Chemistry relevance notes.
What's Covered
Unit 1: Atomic Structure & Properties
- Atomic Models
- Electron Configuration
- Periodic Trends
- Isotopes & Mass Spectrometry
Unit 2–3: Bonding & Intermolecular Forces
- Ionic & Covalent Bonds
- Lewis Structures
- VSEPR Theory
- Intermolecular Forces
Unit 4–5: Reactions & Kinetics
- Stoichiometry
- Types of Reactions
- Reaction Rates
- Rate Laws & Mechanisms
Unit 6–7: Thermodynamics & Equilibrium
- Enthalpy & Hess's Law
- Gibbs Free Energy
- Le Chatelier's Principle
- Ksp & Solubility
Unit 8–9: Acids/Bases & Electrochemistry
- pH & pOH
- Strong vs Weak Acids
- Buffers & Titrations
- Galvanic & Electrolytic Cells
About the AP Chemistry Exam
Format
- • Section I: 60 MCQs in 90 minutes
- • Section II: 7 FRQs in 105 minutes
- • 3 long FRQs + 4 short FRQs
- • Total exam time: 3 hours 15 minutes
- • Calculator allowed on FRQs
Scoring
- • Score range: 1–5
- • 5 = Extremely well qualified
- • ~12% of students score a 5
- • No penalty for guessing
- • Most colleges accept 4+