Physics
Molecular shapes
Molecules in three dimensions with their shapes worked out, not looked up: the library holds only what is bonded to what, and the tetrahedron, the ring, the octahedron and the buckyball fall out of a relaxation you can watch.
What happens
Nothing here is looked up: the library says only what is bonded to what, and the structure is relaxed on screen until the tetrahedron's 109.47°, water's 104°, benzene's flat hexagon at 1.398 Å and the closed buckyball fall out on their own. Lone pairs are drawn as pale lobes with no atom on the end, because they are the reason water is bent. The panel prints what the model found next to what the laboratory measured, so you can watch it be right - and, in cubane's case, fail its own rules and print what that costs. The showcase holds 84 molecules on a shelf along the bottom - click one to lift it onto the table - with cards, chips and a search in the panel; beside each stands the dipole moment computed from its geometry next to the measured one, and the gold arrow draws it.
Equations used in the module
Equations VSEPR: domains repel on a sphere, E = Σ 1 / r_ij lone pairs repel more than bonds 2 → linear 180°, 3 → 120°, 4 → 109.5°, 6 → 90°
