Molecule Shapes: free chemistry simulation
Type any molecule or ion, or build one in 3D. VSEPR predicts the shape and bond angles.
▶ Open the simulationFree, no sign-up. Works on phones, tablets and laptops.
The science
Electron pairs around a central atom repel each other and spread out as far as possible. This idea, called VSEPR theory, predicts molecular shapes: linear, trigonal planar, tetrahedral and more. Lone pairs push harder than bonding pairs, which squeezes bond angles.
CH₄: tetrahedral, 109.5°
Things to try
- Build a molecule with four bonds and read the angle.
- Swap one bond for a lone pair and see the angle shrink.
- Rotate the 3D model to see the shape from every side.
Topics covered
vsepr geometry bond angle lone pair 3d formula
How to use it
Open the simulation, then change the experiment live with the sliders, checkboxes and buttons in the side panel. Drag objects on screen where it makes sense, and use Pause, Step, Speed and Reset in the bottom bar to study every moment.
Frequently asked questions
What does the Molecule Shapes simulation show?
Electron pairs around a central atom repel each other and spread out as far as possible. This idea, called VSEPR theory, predicts molecular shapes: linear, trigonal planar, tetrahedral and more. Lone pairs push harder than bonding pairs, which squeezes bond angles.
What is the key equation?
CH₄: tetrahedral, 109.5°
Is the Molecule Shapes simulation free?
Yes. It runs free in any web browser on phones, tablets and laptops, with no sign-up or download.
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