You can try the first discovery and the 3D controls now. Stella unlocks every stage.
Reaction Hill: Climbing the Activation Energy
Send batches of molecules at an energy hill, watch the crossing fraction follow e^(-Ea/kT), and flip on a catalyst to open a lower mountain pass.
A landscape with a hill
Last chapter we learned that a bond is a valley of energy. So from one bond to another — how does a reaction proceed? The landscape before you is the answer. On the left is the valley of the reactants, on the right the lower valley of the products. But a hill rises between them. To rearrange the bonds, you must once pass through a half-broken state (the summit = the transition state). First, run the molecules and watch what happens.
Press run the reaction and watch the molecules take on the hill.
You can try the first discovery and the 3D controls now. Stella unlocks every stage.