About Build a Molecule
Starting from atoms, see how many molecules you can build. Collect your molecules and view them in 3D!
How to play Build a Molecule
Everything is hands-on: drag, click and experiment — the simulation reacts instantly. Starting from atoms, see how many molecules you can build.
Questions & answers
- What is Build a Molecule?
- Build a Molecule is a free interactive simulation from PhET Interactive Simulations (University of Colorado Boulder) that you can play right in your browser on crumble.lol — no downloads and no sign-up. Starting from atoms, see how many molecules you can build. Collect your molecules and view them in 3D!
- What can kids learn from Build a Molecule?
- It helps kids explore: describe the difference between an atom and a molecule. build simple molecules from atoms. distinguish between the coefficient and subscript in a chemical formula. construct molecules from the chemical formula. associate common molecule names with multiple representations. experiment with combining atoms to build larger molecules.
- What age is Build a Molecule good for?
- It is designed for middle school (roughly ages 10–14) up to university, and curious kids outside that range can absolutely enjoy poking around it too.
- Is Build a Molecule free to play?
- Yes — Build a Molecule is completely free on crumble.lol and runs fully in your browser on computers and tablets.