Chemistry Notes for TI-84 Plus CE: Ions, Gas Laws, Formulas

How it works The button opens this sheet in the CiNotes notes editor, ready to change. It’s 763 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.

Chemistry reference sheet

Made for regular and honors high school chemistry. Solubility rules differ a little between textbooks, so check yours.

Atoms and electrons

Atomic number	number of protons (= electrons in a neutral atom)
Mass number	protons + neutrons
Average atomic mass	Σ (isotope mass × abundance as a decimal)
Filling order	1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p 6s 4f 5d 6p 7s 5f 6d 7p
Sublevel capacity	s 2, p 6, d 10, f 14
Periodic trends	radius gets smaller across a period and bigger down a group; ionization energy and electronegativity do the opposite
Diatomic elements	H₂, N₂, O₂, F₂, Cl₂, Br₂, I₂

Common polyatomic ions

+1	NH₄⁺ ammonium; H₃O⁺ hydronium
−1	OH⁻ hydroxide; CN⁻ cyanide; NO₃⁻ nitrate; NO₂⁻ nitrite; C₂H₃O₂⁻ acetate; MnO₄⁻ permanganate; SCN⁻ thiocyanate; HCO₃⁻ hydrogen carbonate; HSO₄⁻ hydrogen sulfate; H₂PO₄⁻ dihydrogen phosphate
Chlorine oxyanions (−1)	ClO⁻ hypochlorite; ClO₂⁻ chlorite; ClO₃⁻ chlorate; ClO₄⁻ perchlorate
−2	CO₃²⁻ carbonate; SO₄²⁻ sulfate; SO₃²⁻ sulfite; S₂O₃²⁻ thiosulfate; CrO₄²⁻ chromate; Cr₂O₇²⁻ dichromate; C₂O₄²⁻ oxalate; O₂²⁻ peroxide; HPO₄²⁻ hydrogen phosphate
−3	PO₄³⁻ phosphate
Name pattern	-ate has one more O than -ite; per-…-ate has one more O than -ate; hypo-…-ite has one fewer O than -ite

Naming

Ionic	cation, then anion (-ide for single atoms): NaCl sodium chloride
Transition metals	Roman numeral for the charge: FeCl₃ iron(III) chloride
Covalent prefixes	mono, di, tri, tetra, penta, hexa, hepta, octa, nona, deca (no mono on the first element): N₂O₄ dinitrogen tetroxide
Acids	-ide → hydro-…-ic acid (HCl); -ate → -ic acid (HNO₃ nitric); -ite → -ous acid (HNO₂ nitrous)

Solubility rules (common version)

Always soluble	group 1 ions, NH₄⁺, NO₃⁻, acetate
Chlorides, bromides, iodides	soluble, except with Ag⁺, Pb²⁺, Hg₂²⁺
Sulfates	soluble, except with Ba²⁺, Sr²⁺, Pb²⁺, Ca²⁺, Hg₂²⁺
Carbonates, phosphates, sulfides	mostly insoluble, except with group 1 ions and NH₄⁺
Hydroxides	mostly insoluble, except group 1; Ca, Sr and Ba hydroxides are slightly soluble

Reactions and moles

Reaction types	synthesis A + B → AB; decomposition AB → A + B; single replacement A + BC → AC + B; double replacement AB + CD → AD + CB; combustion fuel + O₂ → CO₂ + H₂O
Balancing	change coefficients, never subscripts
Moles	mol = grams ÷ molar mass; particles = mol × 6.022 × 10²³; 1 mol of gas at STP = 22.4 L
Percent yield	actual ÷ theoretical × 100
Percent by mass	mass of element ÷ mass of compound × 100
Empirical formula	grams → moles, divide by the smallest, round to whole numbers

Gas laws

Boyle	P₁V₁ = P₂V₂
Charles	V₁/T₁ = V₂/T₂
Gay-Lussac	P₁/T₁ = P₂/T₂
Avogadro	V₁/n₁ = V₂/n₂
Combined	P₁V₁/T₁ = P₂V₂/T₂ (T in kelvin: K = °C + 273.15)
Ideal gas	PV = nRT; R = 0.0821 L·atm/(mol·K) = 8.314 L·kPa/(mol·K)
Dalton	P_total = P₁ + P₂ + …
Graham	rate₁/rate₂ = √(M₂/M₁)
Pressure units	1 atm = 760 mm Hg = 760 torr = 101.325 kPa

Solutions, heat and pH

Molarity and molality	M = mol solute / L solution; m = mol solute / kg solvent
Dilution	M₁V₁ = M₂V₂
Heat	q = mcΔT; melting q = mH_f; boiling q = mH_v
Water	c = 4.18 J/(g·°C); H_f = 334 J/g; H_v = 2260 J/g
pH	pH = −log[H⁺]; pOH = −log[OH⁻]; pH + pOH = 14 at 25 °C

Measurement

Percent error	\|measured − accepted\| ÷ accepted × 100
Sig figs	nonzero digits count; zeros between them count; leading zeros never count; trailing zeros count only with a decimal point
Rounding	× and ÷ keep the fewest sig figs; + and − keep the fewest decimal places
Prefixes	k = 10³, c = 10⁻², m = 10⁻³, µ = 10⁻⁶, n = 10⁻⁹

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 “nitrate” or “Charles” to jump straight to it. The notes are stored in Archive, so a RAM clear won’t erase them.

Put this on my TI-84 Plus CE

Want your own class notes on there too?

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.

Upload my notes or PDF

Common questions

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

This sheet is 763 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 9,237 more words).

Which polyatomic ions are on the sheet?

26 of the common ones from a first-year chemistry list, from ammonium and nitrate to dichromate and thiosulfate, plus the -ate/-ite naming pattern. If your teacher’s list has others, add them in the editor before you check out.

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: AP 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.

Chemistry notes for your TI-84 Plus CE: ions, gas laws and formulas