AP Chemistry

AP Chem Equation Sheet

Use the official AP Chemistry equations and constants sheet as a reference map for 2026 FRQs, formula selection, units, and common traps.

Official reference

What the equation sheet can actually help with

The official AP Chemistry reference information includes a periodic table, unit conversions, constants, and equation groups for atomic structure, solutions, kinetics, equilibrium, thermodynamics, and electrochemistry. The useful study move is mapping each section to the type of FRQ task it supports.

Open official equation sheet

Do not use it as a crutch

The sheet gives relationships, not the decision tree. You still need stoichiometry, units, signs, graph reading, and written justification.

Reference map

Equation sheet sections and 2026 FRQ uses

This table connects official reference-sheet sections to the kinds of tasks students saw on the released 2026 AP Chemistry FRQ.

Reference section	What it gives you	Where it helps
Periodic table	Atomic masses, element symbols, periodic position.	Q1 K/K+ radius reasoning, Q5 bond polarity, and any molar-mass calculation.
Unit symbols and conversions	Common units and conversion anchors such as atm, torr, joule, volt, coulomb, ampere, and Celsius/Kelvin conversion.	Calorimetry, electroplating, gas law, and rate-unit problems.
Atomic structure	Energy, frequency, wavelength, Coulombic force, and constants.	Ion size, attraction, and particle-level reasoning.
Gases, liquids, and solutions	PV relationships, mole fraction, density, molarity, Beer-Lambert law.	Q6 spectrophotometry and concentration reasoning; possible gas-equilibrium work.
Kinetics	Integrated rate laws and half-life relationships.	Q2 first-order kinetics and ln concentration plot reasoning.
Equilibrium and acid-base	Kc, Kp, Kw, pH, pOH, Ka, Kb, pKa, pKb, Henderson-Hasselbalch.	Q1 Ksp/common-ion reasoning, Q3 nitrous acid and titration reasoning, Q4 Kp.
Thermodynamics/electrochemistry	q = mcΔT, ΔH, ΔS, ΔG, ΔG = -RT ln K, ΔG = -nFE°, Nernst-style relationship, q = It.	Q1 calorimetry, Q2 electroplating and ΔG, Q4 temperature favorability, Q7 ΔHf and heat released.

Still required

What the formula sheet will not do for you

Most AP Chem FRQ point loss happens after a student chooses a formula: wrong coefficient, wrong unit, missing explanation, or weak connection to prompt evidence.

Missing skill	Why the sheet is not enough	Fix
Which equation to choose	The sheet gives formulas but not the decision tree.	Underline what the prompt asks for, identify the known variables, then choose the relationship.
Stoichiometry before formulas	Equations do not automatically handle limiting reactants or coefficients.	Balance the chemical equation and convert to moles before using heat, charge, or K relationships.
Units and signs	The sheet lists units but does not decide whether the answer should be positive, negative, released, absorbed, per mole, or total.	Write a one-line meaning statement beside the final value.
Graph interpretation	The sheet gives rate laws and Beer-Lambert law, but not how to read a slope, intercept, or calibration curve.	Copy axis labels and units into the setup before calculating.
Justification language	The sheet cannot replace particle-level explanations.	Use claim + evidence + chemistry reason for explanation points.

FAQ

Quick answers

Is there an AP Chem equation sheet?

Yes. College Board provides AP Chemistry exam reference information with equations, constants, and a periodic table.

Can I use the equation sheet on both sections?

The official AP Chemistry exam materials and calculator policy support using reference information during the exam; always follow the current exam directions in Bluebook.

Does the equation sheet include every thing I need?

No. It gives relationships and constants, but students still need to choose the correct equation, show stoichiometry, handle units, and justify answers.

Should I memorize the whole sheet?

No. Practice recognizing when each section applies, especially kinetics, equilibrium, thermodynamics, electrochemistry, and solutions.