Chemistry
Start small and build up: make an atom, bond atoms into molecules, react them in the lab, then see how stars fuse nuclei. Each tool has a guided tour, a simulation of a famous experiment and the formulas behind it.
The tools, in learning order
- 01Atom BuilderAdd protons, neutrons and electrons and watch any of the 118 elements, isotopes and ions take shape.
- 02Electron LabFire photons at an atom: watch electrons jump between shells, glow in colour and finally escape.
- 03Molecule BuilderDrag atoms together to form single, double and triple bonds and discover real molecules.
- 04Chemistry LabPour chemicals into a beaker, heat them over a Bunsen burner and watch real reactions.
- 05States of MatterHeat ice until it melts and boils: watch the particles change and the heating curve draw itself, flat steps and all.
- 06Chemical EnergeticsCollide molecules over an activation-energy hill and watch exothermic reactions heat up and endothermic ones cool down.
- 07ElectrolysisSwitch on a power pack and watch ions drift to the electrodes: copper plates the cathode and gases bubble into the tubes.
- 08Nuclear FusionHeat a plasma and fire nuclei together to see how the Sun turns mass into energy.
- 09Chemistry FormulasEvery chemistry equation, live: type numbers or pull them from what you built.
Chemistry articles
Electrolysis Explained: What Happens at Each Electrode
Electrolysis splits ionic compounds with electricity. Learn what forms at the cathode and anode, how to write half equations, why brine gives hydrogen, and try it in 3D.
21 October 2026 · 6 min readExothermic and Endothermic Reactions Explained
Exothermic reactions give out heat; endothermic ones take it in. Learn why, read energy profile diagrams, work out ΔH from bond energies and watch molecules react in 3D.
21 October 2026 · 6 min readIonic vs Covalent Bonds: What's the Difference?
Ionic bonds transfer electrons and make charged ions; covalent bonds share them. Learn to tell them apart, compare their properties in a table and build molecules in 3D.
21 October 2026 · 6 min readStates of Matter: Solids, Liquids and Gases Explained
Solids, liquids and gases are the same particles with different amounts of energy. See how they move, why melting and boiling stay at one temperature, and heat ice in 3D.
21 October 2026 · 7 min readWhy Are Fireworks Different Colours? It's the Electrons
Firework colours come from electrons jumping between energy levels in metal atoms. Here's how it works, why each metal has its own colour, and how flame tests use it.
17 October 2026 · 5 min readWhat Is an Isotope? A Simple Explanation with Examples
Isotopes are atoms of the same element with different numbers of neutrons. Learn what that means, why some isotopes are radioactive, and build one yourself in 3D.
12 October 2026 · 3 min read
