AP Chemistry Formulas on Your TI-84 Plus CE (Notes Pack)

How it works The button opens this sheet in the CiNotes notes editor, ready to change. It’s 769 words, so it’s a one-time $3 (typed notes are free up to 300 words). You get a ZIP by email to send to your calculator. Works on the TI-84 Plus CE and CE Python. On OS 5.5 or newer, do the free one-time setup first.

AP Chemistry formula sheet

Checked against the College Board’s AP Chemistry equations and constants sheet, plus the key facts that sheet leaves out (trends, IMFs, strong acids, sign rules). Units are SI unless noted.

Constants

Gas constant R	8.314 J/(mol·K) = 0.08206 L·atm/(mol·K) = 62.36 L·torr/(mol·K)
Pressure	1 atm = 760 mm Hg = 760 torr
STP	273.15 K and 1.0 atm; ideal gas molar volume 22.4 L/mol
Kelvin	K = °C + 273.15
Avogadro’s number	6.022 × 10²³ mol⁻¹
Planck’s constant	h = 6.626 × 10⁻³⁴ J·s
Speed of light	c = 2.998 × 10⁸ m/s
Faraday’s constant	F = 96,485 C/mol e⁻
Water	K_w = 1.0 × 10⁻¹⁴ at 25 °C; specific heat 4.18 J/(g·°C)

Atoms and light

Photon energy	E = hν
Wave speed	c = λν
Coulomb’s law (trend)	force ∝ q₁q₂/r²
Average atomic mass	Σ (isotope mass × fractional abundance)
Periodic trends	radius shrinks across a period and grows down a group; ionization energy and electronegativity do the opposite (with exceptions)

Bonding and intermolecular forces

London dispersion	every molecule; more electrons, stronger
Dipole–dipole	polar molecules
Hydrogen bonding	H bonded to N, O or F
Formal charge	valence e⁻ − nonbonding e⁻ − ½(bonding e⁻)
VSEPR	2 domains linear 180°; 3 trigonal planar 120°; 4 tetrahedral 109.5°; 5 trigonal bipyramidal; 6 octahedral
Hybridization	sp = 2 domains, sp² = 3, sp³ = 4
Sigma and pi	single = 1σ; double = 1σ + 1π; triple = 1σ + 2π

Gases and solutions

Ideal gas law	PV = nRT
Combined gas law	P₁V₁/T₁ = P₂V₂/T₂
Dalton’s law	P_total = P_A + P_B + …; P_A = P_total × X_A
Moles and density	n = m/M; D = m/V
Kinetic energy	KE = ½mv²
Molarity	M = mol solute / L solution
Dilution	M₁V₁ = M₂V₂
Beer–Lambert law	A = εbc

Kinetics

Rate law	rate = k[A]^m[B]ⁿ
Zero order	[A]_t − [A]₀ = −kt (straight line: [A] vs t)
First order	ln[A]_t − ln[A]₀ = −kt (straight line: ln[A] vs t)
Second order	1/[A]_t − 1/[A]₀ = kt (straight line: 1/[A] vs t)
First-order half-life	t_½ = 0.693/k

Equilibrium

K_c for aA + bB ⇌ cC + dD	K_c = [C]^c[D]^d / ([A]^a[B]^b), leaving out pure solids and liquids
K_p	K_p = (P_C)^c(P_D)^d / ((P_A)^a(P_B)^b)
Q vs K	Q < K shifts right; Q > K shifts left; Q = K at equilibrium
Changing the reaction	reverse: 1/K; multiply by n: Kⁿ; add reactions: multiply the Ks
Only temperature	changes the value of K

Acids and bases

pH and pOH	pH = −log[H₃O⁺]; pOH = −log[OH⁻]; pH + pOH = 14 at 25 °C
K_a and K_b	K_a = [H₃O⁺][A⁻]/[HA]; K_b = [OH⁻][HB⁺]/[B]
Conjugate pair	K_w = K_a × K_b; pK_a + pK_b = 14 at 25 °C
Henderson–Hasselbalch	pH = pK_a + log([A⁻]/[HA])
Half-equivalence point	pH = pK_a
Strong acids	HCl, HBr, HI, HNO₃, H₂SO₄, HClO₄
Strong bases	group 1 hydroxides, Ca(OH)₂, Sr(OH)₂, Ba(OH)₂

Thermodynamics

Heat	q = mcΔT
Enthalpy of reaction	ΔH° = Σ ΔH°_f(products) − Σ ΔH°_f(reactants)
From bond energies	ΔH = bonds broken − bonds formed
Entropy and free energy	ΔS° and ΔG° use the same products − reactants form
Gibbs free energy	ΔG° = ΔH° − TΔS° = −RT ln K = −nFE°
Favorability	ΔG° < 0 favored, and then K > 1
Sign table	−ΔH, +ΔS: always favored; +ΔH, −ΔS: never; −ΔH, −ΔS: favored at low T; +ΔH, +ΔS: favored at high T

Electrochemistry

Current	I = q/t
Cell potential	E°_cell = E°_cathode − E°_anode (both as reduction potentials)
Nernst equation	E = E° − (RT/nF) ln Q
Electrolysis	mol e⁻ = It/F (t in seconds)
OIL RIG	oxidation at the anode, reduction at the cathode

What it looks like on the calculator

The calculator version is the same sheet in plain text with short lines, so it fits the screen. Square roots are written as sqrt( ), powers with ^ and Greek letters as words. On the calculator, search a word like “Nernst” or “buffer” to jump straight to it. The notes are stored in Archive, so a RAM clear won’t erase them.

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Upload your teacher’s study guide or review packet as a PDF ($3 for up to 10 pages), or paste in your own notes. Diagrams come through as pictures.

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Common questions

How much does it cost to put this on my calculator?

This sheet is 769 words, so it’s a one-time $3. Typed notes are free up to 300 words and $3 from 301 to 10,000 words. If you cut it down to 300 words or fewer, it’s free. You can also add your own notes to the same order, up to 10,000 words in total (about 9,231 more words).

Is this the official AP Chemistry equation sheet?

No. It’s our own study sheet. The equations and constants were checked against the College Board’s published AP Chemistry equations and constants sheet, and we added facts students usually look up separately, like strong acids, periodic trends and the ΔH/ΔS sign table.

Can I change the notes before I pay?

Yes. The button opens the sheet in the CiNotes notes editor. Delete what you don’t need, add your teacher’s examples, and check the calculator preview before you check out.

Will it work on my calculator?

It works on the TI-84 Plus CE and the TI-84 Plus CE Python. It doesn’t work on the TI-84 Evo or on black-and-white TI-84s. If your calculator is on OS 5.5 or newer, it needs a free one-time setup first. The setup guide walks you through it.

Will the notes disappear if my calculator resets?

No. The notes are stored in Archive, so a RAM clear won’t erase them. On OS 5.5 or newer, open AsmHook2 from the APPS menu once after a RAM clear, then open your notes as usual.

More subject sheets: Chemistry, AP Physics 1, AP Calculus AB, AP Statistics, Precalculus, Unit circle and trig identities, Algebra 2. Or see all formula notes, every way to put notes on a TI-84, and what CiNotes is.

AP Chemistry formulas for your TI-84 Plus CE