Chemistry tools

Look up any compound, or practice on problems that are checked as you go. No account needed.

Look up a compound

Type a formula and see its structure, formal charges, shape, resonance or molar mass, with the reasoning.

Formula in, structure, formal charges, and a full explanation out.

Electron and molecular geometry at every atom, AXE notation, bond angles, and a 3D model.

Every valid resonance contributor, what changes between them, and the average bond order.

Two structures side-by-side: bonding, charges, molecular geometry.

Molar mass of a formula, ion or compound name, with each element's share shown.

Work problems yourself. Every answer is checked, and a wrong one tells you what to look at.

Draw structures yourself on a live canvas: pick a difficulty and keep going.

Solve the whole structure step by step: budget, bonds, charges, shape.

Random compounds by difficulty, each solved end to end in Solve Mode.

Shape questions from the steric number up: AXE notation, both geometries, bond angles, one compound after another.

Charges, cations and anions, electron counts, and the ions a salt is built from.