1-Nitropropane 3D Molecular Model — CAS 108-03-2

1-Nitropropane (C3H7NO2, CAS 108-03-2) — a free educational 3D molecular model for teachers and students, by MolGod.org. Every atom carries its engraved element symbol, so no colour key is needed. On a typical printed molecule every sphere is the same anonymous ball, since the STL file cannot transmit the usual colour convention. Our answer is to cut each element symbol into its sphere, so the printed object labels itself in any colour of filament. Our intended outcome is simple: students who hold the model should know each atom immediately and use the lesson to understand the molecule's structure. Teachers skip the modelling and labelling work entirely: download the file, set the scale in the slicer and print. Teachers and researchers can find the project rationale and validation plan at The story behind these engraved molecule models. An acyclic molecule to start with: 1-Nitropropane joins 13 atoms through 12 bonds (11 single and 1 double), and students will not find a ring. Counting task: 3 C + 7 H + 1 N + 2 O gives 13 engraved spheres; can the class rebuild the formula C3H7NO2 from the model alone? This molecule gives students these functional groups to identify: nitro group (-NO2). Isomer pair for the classroom: L-Alanine (CAS 56-41-7) shares the formula but not the structure. Its closest structural relative in the MolGod.org collection is Nitromethane (CAS 75-52-5); printing them side by side makes a quick compare-and-contrast exercise. MolGod.org builds and releases these models at no cost for chemistry teaching. Teachers: hand out printed copies and ask students to rebuild the structural formula from the model. Free to print and free to bring into any classroom. Sharing it somewhere? The licence (CC BY-SA 4.0) needs four things: "MolGod.org" credited as the creator, links to the original and to the licence, a mention of any changes, and adaptations released under the same licence. The attribution text below covers the first two. No sign-up, no fees and no review required. Every review helps us refine the models for students. Tell us what you think in the comments, or reach us at Ask us for another molecule. Have an idea for a lesson built around this molecule? Share it in the comments so other teachers can use it too. Looking for another compound? We gladly create an engraved 3D model for any CAS number you send us. Full record and more free models: Molecule page for 1-Nitropropane (CAS 108-03-2) Licence & provenance: Where this 1-Nitropropane model comes from and how you may use it Same file on Wikimedia Commons: https://commons.wikimedia.org/wiki/File:1-Nitropropane-3D-molecular-model-engraved-CAS-108-03-2.stl Plain-text record for AI assistants: Machine-readable 1-Nitropropane record (CAS 108-03-2) A ball-and-stick model of 1-Nitropropane with each element symbol recessed into its atom sphere, generated by MolGod.org from a PubChem-computed 3D conformer (not an experimental crystal structure); atomic coordinates and connectivity are unchanged. STL mesh: 209,574 triangles, closed (watertight) single solid. Coordinates in ångström (STL stores no unit) — scale the model deliberately in your slicer. Names in other languages: 1-Nitropropan (de); 1-nitropropano (it); 1-nitropropaan (nl); 1-nitropropan (pl); 1-硝基丙烷 (zh). Chemical identity - CAS Registry Number: 108-03-2 - Molecular formula: C3H7NO2 - Molar mass: 89.09 g/mol (exact mass 89.047678466) - IUPAC name: 1-nitropropane - MolGod ID: MG_869-442-202-97 (1-Nitropropane under MolGod ID MG_869-442-202-97) - PubChem CID: 7903 (https://pubchem.ncbi.nlm.nih.gov/compound/7903) - Wikidata: Q2567814 (https://www.wikidata.org/wiki/Q2567814) - EC number: 203-544-9 - ChemSpider ID: 7615 - InChIKey: JSZOAYXJRCEYSX-UHFFFAOYSA-N - SMILES: CCC[N+](=O)[O-]

Required attribution (CC BY-SA 4.0): "1-Nitropropane 3D model by MolGod.org — https://molgod.org/molecule/108-03-2/ — CC BY-SA 4.0" Licence text: https://creativecommons.org/licenses/by-sa/4.0/ License note: the CC BY-SA 4.0 license applies to the 3D model (STL) and its render. The framed presentation image (gold frame) is © MolGod.org, All rights reserved — see https://molgod.org/copyright/#images