Learn chemistry by experimenting
A hands-on course that starts inside a single atom and never stops mixing: every lesson pairs readable theory with an interactive lab you can poke, heat, dilute and overdose — then a short quiz locks it in. It ends with real experiments at your kitchen table and a battery you grow out of lemons.
The Atom
0/3Matter's alphabet: what atoms are made of, where their electrons live, and the one chart that organizes all of chemistry.
Atoms: The Alphabet of Matter
Everything you can touch is spelled with just 118 letters. Each letter is an atom — and three tiny particles decide which one.
Electron Shells: Where Electrons Live
Electrons don't orbit anywhere they like — they stack into shells. The outermost shell writes all the chemistry.
The Periodic Table: Chemistry's Map
118 elements, one chart — and once you see how it's sorted, you can predict chemistry you've never been taught.
Chemical Bonds
0/3Why atoms stick together at all: electron theft, electron sharing, and the electron sea — three deals, one goal: a full outer shell.
Ionic Bonds: Give and Take
Sodium wants to lose an electron; chlorine wants to gain one. The deal of the century — and the reason salt exists.
Covalent Bonds: Sharing Pairs
When neither atom will surrender an electron, they compromise: shared pairs that count for both. Welcome to molecules.
Metallic Bonds & the Bond Spectrum
Metals share an electron sea; molecules share unevenly. One number — electronegativity — sorts every bond in between.
Reactions & the Mole
0/3Reactions rearrange atoms but never create or destroy them — and the mole is the trick that lets you weigh the invisible.
Chemical Reactions & Balancing
Burning, rusting, baking — every reaction is the same move: old bonds break, new bonds form, and every single atom survives.
The Mole: Chemistry's Dozen
Atoms are too small to count, so chemists count in batches of 6 × 10²³ — a batch sized so the scale does the counting for you.
Stoichiometry: Recipe Math
Balanced equation + mole bridge = the power to predict exactly how many grams come out — and which ingredient runs out first.
States of Matter & Solutions
0/3The same particles, dancing three different dances — and what happens when one substance disappears into another.
Solid, Liquid, Gas
Ice, water and steam are the same molecule at three energy levels. Temperature just changes the dance.
Gases & the Ideal Gas Law
A gas is chaos with rules. Four knobs — pressure, volume, temperature, amount — locked together by one equation.
Solutions & Concentration
Where does salt go when it dissolves — and how much can water hold? Enter saturation, solubility curves and molarity.
Acids, Bases & the Kitchen Capstone
0/3The chemistry of sour and slippery, the logarithmic scale that measures it — and a capstone you cook at home.
Acids & Bases: The pH Scale
Sour foods, stinging cleaners, and your own stomach share one particle: H⁺. Counting it takes a logarithm.
Neutralization & Titration
Drip base into acid until one drop flips the color — and you've counted particles you can't see, to three digits.
Capstone: The Kitchen Lab
Three real experiments with supermarket chemicals: brew a pH indicator, size a CO₂ balloon by stoichiometry, and grow crystals.
Progress & backup
this browser onlyProgress lives in this browser; sync keeps a server copy reachable only by your code, and exports are plain files you own. Imports and links always merge — nothing is overwritten.