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
0/5Why 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.
Molecular Shapes & Why Water Is Bent
Electron groups repel and push as far apart as they can. The shape that results decides whether a molecule is polar — and water's shape decides most of biology.
Intermolecular Forces
The weak attractions between molecules decide whether something is a gas, a liquid or a solid — and they are the reason water behaves like nothing else.
Reactions & the Mole
0/4Reactions 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 Five Kinds of Reaction
Most reactions you will ever meet follow one of five patterns. Recognise the pattern and you can predict the products of a reaction you have never seen.
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.