Computed, not drawn
Phase diagrams, titration curves, spectra, and colours are computed by testable chemistry models; every model has unit tests and a stated range of validity.
Open source · bilingual · works offline
Chemistry you can see,
principles you can handle.
An interactive chemistry textbook, an always-open virtual lab, and an atlas generated from real data. From atoms to instruments, every curve and every reading is computed live by chemistry models in your browser.
pH meter 5.17
72.0% of the acid is acetate
Colour, pH, and curve come from one calculation: the charge balance gives pH, absorption spectra give colour.
Four ways into chemistry
- Learning path Six parts in order: matter and atoms → bonds and structure → energy and change → reactions in solution → the elements → measurement and analysis. Every lesson has predictions, hands-on models, worked examples, and checks. 148 lessons in 24 units
- Virtual lab Burettes, pH meters, spectrophotometers… follow real procedures, record data, determine unknowns, then compare with the model. 39 experiments
- Atlas Data pages and periodic trends for 118 elements, 3D molecules and crystals, reference tables — all generated from data. 118 elements
- Deep-dive stories Twelve scroll-driven long reads that turn phase diagrams, entropy, batteries, and spectra into stories you can walk through. 12 stories
The path at a glance
Start from a single atom; finish able to analyse an unknown solution quantitatively.
- Part I · Matter and atoms
- Part II · Bonds and structure
- Part III · Energy and change
- Part IV · Reactions in solution
- Part V · The elements
- Part VI · Measurement and analysis
Three principles we do not bend
Three views at once
Macroscopic observation, particles, and symbolic equations share one state: move one and the other two follow.
Evidence in layers
Measured data, teaching models, and explanatory animation are kept distinct; where an approximation fails, we say so.