--- title: "Ozone depletion by CFCs Template – Chemistry Diagram | MolDraw" url: https://www.moldraw.com/templates/school-ozone-depletion/ description: "Ozone depletion by CFCs template: Free-radical destruction of stratospheric ozone for A-level and NCERT: how ozone forms and absorbs UV (Chapman cycle)…" lang: en publisher: Scidart Academy generated: 2026-11-13 --- [MolDraw](https://www.moldraw.com/) › [Templates](https://www.moldraw.com/templates/) › [General & inorganic](https://www.moldraw.com/templates/general-and-inorganic/) › Ozone depletion by CFCs [General & inorganic](https://www.moldraw.com/templates/general-and-inorganic/)Premium # Ozone depletion by CFCs template ![Ozone depletion by CFCs template: Free-radical destruction of stratospheric ozone for A-level and NCERT: how ozone forms and absorbs UV (Chapman cycle), initiation by UV homolysis of a CFC (CF₂Cl₂), the propagation steps Cl· + O₃ → ClO· + O₂ and ClO· + O₃ → Cl· + 2O₂ drawn as a catalytic cycle, the net 2O₃ → 3O₂, and the similar NO· cycle.](https://www.moldraw.com/templates/school-ozone-depletion.webp) [Edit in MolDraw](https://www.moldraw.com/)Download with Pro Premium template. Preview and edit it free in MolDraw; downloading and exporting it is part of [MolDraw Pro](https://www.moldraw.com/pricing). Free-radical destruction of stratospheric ozone for A-level and NCERT: how ozone forms and absorbs UV (Chapman cycle), initiation by UV homolysis of a CFC (CF₂Cl₂), the propagation steps Cl· + O₃ → ClO· + O₂ and ClO· + O₃ → Cl· + 2O₂ drawn as a catalytic cycle, the net 2O₃ → 3O₂, and the similar NO· cycle. ## What the template shows - UV splits a C–Cl bond; the chlorine radical then destroys ozone in a chain: 2O₃ → 3O₂ - Ozone layer: made and broken by UV - Propagation: the chlorine cycle - UV, λ < 320 nm: this absorption shields the Earth - Initiation: UV breaks a CFC - UV in the stratosphere: the weaker C–Cl bond breaks (homolysis), not C–F - Nitrogen monoxide does the same - net: NO· (from aircraft and lightning) is a catalyst too - Cl· is regenerated: it is a catalyst - CFCs are unreactive and non-toxic, so they survive long enough to drift into the stratosphere, where UV breaks the C–Cl bond (weaker than C–F) to give chlorine radicals. - Cl· is used in the first propagation step and regenerated in the second, so it acts as a catalyst: one chlorine atom can destroy many thousands of ozone molecules before it is trapped. - Chain termination: radicals combine or form reservoir molecules (HCl, ClONO₂), which polar stratospheric clouds turn back into Cl₂ each spring, giving the Antarctic ozone hole. - The Montreal Protocol (1987) phased out CFCs. Replacements such as HFCs (e.g. CH₂FCF₃) have no C–Cl bond, so they do not deplete ozone (but are greenhouse gases). - Every part of this figure is editable · sources on the template card Drawn with 148 shapes – every one editable in MolDraw. ## Sources - [Housecroft & Sharpe, Inorganic Chemistry, 5th ed., Pearson 2018, ch. 16](https://openlibrary.org/isbn/9781292134147) Textbook - [NCERT, Chemistry Part II, Class XI (pre-2023 edition), ch. 14 Environmental Chemistry](https://ncert.nic.in/) Textbook ## How to use this template 1. Press **Edit in MolDraw**. The template opens on the canvas of the free MolDraw editor. 2. Change anything: move structures, edit atoms and labels, recolour highlights or delete what you do not need. 3. Add your own structures, arrows and text next to it, or combine several templates on one page. 4. Export the drawing as PNG, SVG or PDF for slides, worksheets, theses and papers. ## Frequently asked questions ### Is the Ozone depletion by CFCs template free? You can preview the Ozone depletion by CFCs template here and open and edit it in MolDraw for free. Downloading or exporting it is part of MolDraw Pro, together with the other premium templates. ### Can I edit the Ozone depletion by CFCs template? Yes. It opens as an ordinary MolDraw drawing, so every structure, arrow, label and colour can be changed, and you can add your own content around it. ### Is the chemistry checked? Every structure is checked with RDKit and every curly arrow passes MolDraw’s electron-flow audit. The sources used are listed on this page. ### Which MO diagrams are included? H₂ and He₂, N₂ and O₂ (showing s–p mixing and paramagnetic O₂), and carbon monoxide. ## More general & inorganic templates [**VSEPR shapes**Free · General & inorganic](https://www.moldraw.com/templates/genchem-vsepr-shapes/)[**MO diagrams: N₂ and O₂**Free · General & inorganic](https://www.moldraw.com/templates/genchem-mo-n2-o2/)[**Crystal field splitting**Free · General & inorganic](https://www.moldraw.com/templates/genchem-crystal-field/)[**Born–Haber cycle: NaCl**Premium · General & inorganic](https://www.moldraw.com/templates/genchem-born-haber-nacl/)[**MO diagram: H₂ and He₂**Premium · General & inorganic](https://www.moldraw.com/templates/genchem-mo-h2/)[**MO diagram: carbon monoxide**Premium · General & inorganic](https://www.moldraw.com/templates/genchem-mo-co/)[**High spin and low spin: d⁶**Premium · General & inorganic](https://www.moldraw.com/templates/genchem-high-low-spin/)[**Hess's law: ΔfH of carbon monoxide**Premium · General & inorganic](https://www.moldraw.com/templates/genchem-hess-co/) ## Related pages [**VSEPR & Molecular Geometry Worksheet**Free printable worksheet](https://www.moldraw.com/educational-materials/vsepr-molecular-geometry-worksheet/)[**Lewis Structure Worksheet**Free printable worksheet](https://www.moldraw.com/educational-materials/lewis-structure-worksheet/)[**Printable Periodic Table**Free printable worksheet](https://www.moldraw.com/educational-materials/printable-periodic-table/)[**All General & inorganic templates**20 templates](https://www.moldraw.com/templates/general-and-inorganic/)[**All chemistry templates**525 templates in 31 categories](https://www.moldraw.com/templates/) MolDraw Pro Download all 525 templates - Export the 437 premium templates as PNG, SVG or PDF - AI chemistry assistant - Structure scanning from images - Cloud save and teaching slides [See Pro plans](https://www.moldraw.com/pricing) Free templates stay free. 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