AP Chemistry FRQ Guide 2026 — Free Response Tips, Format & Scoring
The AP Chemistry free response section is worth 50% of your total score and consists of 7 questions — 3 long and 4 short. Here's the complete breakdown.
AP Chem FRQ Format
| FRQ | Type | Points | Time (approx) |
|---|---|---|---|
| FRQ 1 | Long | 10 pts | ~23 min |
| FRQ 2 | Long | 10 pts | ~23 min |
| FRQ 3 | Long | 10 pts | ~23 min |
| FRQ 4 | Short | 4 pts | ~9 min |
| FRQ 5 | Short | 4 pts | ~9 min |
| FRQ 6 | Short | 4 pts | ~9 min |
| FRQ 7 | Short | 4 pts | ~9 min |
| Total | 46 pts | 105 min |
The 46 FRQ raw points scale to 75 composite points (50% of 150).
Important: You may use a calculator and the AP Chemistry reference sheet (periodic table, equations, constants) during the entire FRQ section.
The 3 Long FRQs
Each long FRQ (10 pts) has 4–6 sub-parts covering multiple chemistry concepts. Long FRQs frequently combine:
- A quantitative calculation (stoichiometry, equilibrium, electrochemistry, kinetics)
- A conceptual explanation (why does this happen at the atomic/molecular level?)
- A prediction (what would happen if we changed X?)
- A representation (draw a particulate diagram, Lewis structure, or graph)
Common long FRQ topics:
- Equilibrium (ICE tables, Le Chatelier's principle, Kc/Kp)
- Acid-base chemistry (pH calculations, buffers, titrations)
- Electrochemistry (galvanic cells, electrolysis, cell potential)
- Thermodynamics (ΔG, ΔH, ΔS, spontaneity)
- Kinetics (rate laws, reaction mechanisms, Arrhenius equation)
The 4 Short FRQs
Each short FRQ (4 pts) focuses on a single concept with 2–3 sub-parts.
Common short FRQ types:
- Explain a trend using atomic/molecular reasoning (bond polarity, intermolecular forces, electronegativity)
- Draw or interpret a particulate diagram
- Write and balance a net ionic equation
- Predict the outcome of a reaction or spectroscopy result
- Compare two substances (solubility, boiling point, conductivity) and explain why
How AP Chem FRQs Are Scored
Point-by-point rubric: each point has a specific correct answer required.
Key scoring rules:
1. Justify with chemistry, not just state an answer "The boiling point of water is higher than ethane's" earns 0. "Water has stronger intermolecular forces (hydrogen bonding) than ethane (London dispersion forces), requiring more energy to vaporize" earns the point.
2. Show your work on every calculation Write the formula → substitute values with units → calculate result with units. If you make an arithmetic error but set up correctly, you earn the method point.
3. Use correct significant figures Answers with incorrect sig figs may lose the point. Match sig figs to the least precise given value.
4. Particulate diagrams must be chemically accurate Atoms correctly bonded, correct ratio, correct phases shown. A diagram showing NaCl as molecules (instead of ions) earns 0 for a particulate question.
5. Net ionic equations must be balanced and in correct form Include phases (aq), (s), (l), (g). Spectator ions must be removed. Charges must balance.
Most Tested Topics on AP Chem FRQs
Based on released exams, these topics appear most frequently:
| Topic | Frequency | Common FRQ task |
|---|---|---|
| Acid-base (Ka, Kb, pH, buffers) | Very high | Calculate pH, explain buffer behavior |
| Equilibrium (ICE tables, K) | Very high | Set up ICE, calculate Kc, apply Le Chatelier |
| IMFs and physical properties | High | Compare boiling points, solubility, viscosity |
| Electrochemistry | High | Cell notation, ΔG°, E°cell |
| Kinetics | High | Rate law from data, activation energy |
| Thermodynamics (ΔG, ΔH, ΔS) | Moderate | Predict spontaneity, calculate ΔG° |
| Particulate diagrams | Moderate | Draw molecules, ions, solutions |
| Spectroscopy (IR, NMR, UV-Vis) | Moderate | Interpret peaks, identify functional groups |
Particulate Diagram Guide
Particulate diagrams appear on roughly 1–2 FRQs per exam. Rules for earning points:
- Atoms: Draw as labeled circles (C, H, O, etc.) or use the exam's notation
- Molecules: Show correct bonding geometry where required
- Solutions: Show ions separated and surrounded by water molecules if dissolving
- Gases: Particles spread out, no bonds between separate molecules
- Ratios: The number of particles must reflect the stoichiometry
Common error: Drawing H₂SO₄ as a molecule in aqueous solution instead of showing H⁺, H⁺, and SO₄²⁻ ions.
Score Impact of FRQs
With compositeMax = 150:
| FRQ Raw | Composite pts | Combined with 35/60 MC, final score |
|---|---|---|
| 41/46 (89%) | ~67 pts | ~109/150 → 4–5 range |
| 32/46 (70%) | ~52 pts | ~94/150 → 4 |
| 23/46 (50%) | ~37.5 pts | ~79/150 → 3–4 |
The 3 long FRQs together are worth 30/46 raw points. Performing well on even 2 of the 3 long FRQs provides a significant composite boost.