Terephthalic Acid 3D Molecular Model — CAS 100-21-0
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Free educational Terephthalic Acid model (C8H6O4, CAS 100-21-0) with an engraved element symbol on every atom.
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Terephthalic Acid (C8H6O4, CAS 100-21-0) — a free educational 3D molecular model for teachers and students, by MolGod.org. Whatever the filament colour, each atom reads clearly thanks to its engraved symbol.
Start with the ring system: Terephthalic Acid has one aromatic 6-membered ring; in total the model carries 18 bonds (10 single, 2 double and 6 aromatic, drawn in Kekulé form). Hand the model round and let students tally the engraved atoms: 8 C + 6 H + 4 O, 18 in total. For a lesson on isomerism, print it together with Isophthalic Acid (CAS 121-91-5) and Phthalic Acid (CAS 88-99-3): the same atoms, arranged differently. Team task: with the model in hand, each group marks the two carboxylic acid groups (-COOH), then writes down what they found. Worth bringing out when the syllabus reaches aromaticity and delocalised electrons, as well as the carbonyl group (C=O).
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.
Full record and more free models: https://molgod.org/molecule/100-21-0/?utm_source=printables&utm_medium=referral&utm_campaign=edu-3d-models
Licence & provenance: https://molgod.org/licenses/stl/100-21-0/
Same file on Wikimedia Commons: https://commons.wikimedia.org/wiki/File:Terephthalic_Acid-3D-molecular-model-engraved-CAS-100-21-0.stl
A ball-and-stick model of Terephthalic Acid 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: 259,018 triangles, closed (watertight) single solid. Coordinates in ångström (STL stores no unit) — scale the model deliberately in your slicer.
Names in other languages: Terephthalsäure (de); acide téréphtalique (fr); acido tereftalico (it); tereftaalzuur (nl); kwas tereftalowy (pl); 对苯二甲酸 (zh).
Chemical identity
CAS Registry Number: 100-21-0
Molecular formula: C8H6O4
Molar mass: 166.13 g/mol (exact mass 166.02660867)
IUPAC name: terephthalic acid
MolGod ID: MG_864-993-681-12 (https://molgod.org/id/MG_864-993-681-12)
PubChem CID: 7489 (https://pubchem.ncbi.nlm.nih.gov/compound/7489)
Wikidata: Q408984 (https://www.wikidata.org/wiki/Q408984)
EC number: 202-830-0
ChemSpider ID: 7208
InChIKey: KKEYFWRCBNTPAC-UHFFFAOYSA-N
SMILES: C1=CC(=CC=C1C(=O)O)C(=O)O
Required attribution (CC BY-SA 4.0): "Terephthalic Acid 3D model by MolGod.org — https://molgod.org/molecule/100-21-0/ — CC BY-SA 4.0"
Licence text: https://creativecommons.org/licenses/by-sa/4.0/