Interactive Simulations

Every simulation includes the governing equations, a guided activity and challenge questions — not just knobs to turn.

Excite electrons to higher shells and watch them fall back, releasing the exact photons that make each element's spectrum.

Mix a hot metal block with cool water in a virtual calorimeter and watch heat flow until both reach one final temperature.

Release two gases on either side of a barrier and watch diffusion mix them, faster when hot and faster when light.

Disturb the brown N2O4/NO2 equilibrium with heat, pressure, and concentration changes, and watch it shift to fight back.

Squeeze, heat, and cool a gas in a virtual piston and watch pressure, volume, and temperature follow the gas laws.

Watch a pile of radioactive atoms decay step by step and discover why half of them are always gone after one half-life.

Dip a virtual pH probe into household solutions, change concentrations, and see how the pH scale responds in real time.

Add base to an acid drop by drop in this interactive simulation and watch the pH curve climb to the equivalence point.