Plastic sulphur

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Plastic sulphur

  1. 1. Plastic Sulphur<br />Green Bay High School<br />Year 12<br />RACHEL SONG<br />
  2. 2. What is Plastic Sulphur ?<br />A form of rubber-like Sulphur<br /> - produced when molten Sulphur is rapidly poured into cold<br /> water. (It is only produced with red molten Sulphur that<br /> contains S8 chains.)<br />The S8chain Sulphur cools too rapidly to allow the chains to reform into crowns and they lose energy while parallel to one another. This creates a structure with the chains all aligned but only held by the Van der Waals’ forces.<br />Plastic sulphur is unstable at room temperature, as the S8 chains slowly return to S8 crown molecules. The rubber-like structure gets more brittle as the crystals are slowly formed.<br />
  3. 3. Steps of Change<br />Yellow solid (20ºC ~ 25ºC)<br />Yellow liquid (113ºC)<br />Dark & extremely viscous liquid (118 ºC)<br />Runny liquid at boiling point (445 ºC)<br />
  4. 4. Yellow Solid<br /><ul><li>Yellow S8 Solid at</li></ul> room temperature<br /> (20ºC ~ 25ºC)<br /><ul><li>Particle:</li></ul>Solid<br /><ul><li>Forces:</li></ul>Van der Waals’<br />force<br /><ul><li>Properties:</li></ul>powder<br />
  5. 5. Yellow Liquid<br /><ul><li>Yellow S8 Liquid</li></ul> at melting point<br /> (113ºC)<br /><ul><li>Particle:</li></ul> Liquid<br /><ul><li>Forces:</li></ul> Van der Waals’<br />force<br /><ul><li>Properties:</li></ul>low viscosity<br />
  6. 6. Dark brown & extremely viscous Liquid<br /><ul><li>Dark brown &</li></ul> extremely viscous<br />S8 Liquid at 180ºC<br /><ul><li>Particle:</li></ul> Liquid<br /><ul><li>Forces:</li></ul> Van der Waals’<br />force<br /><ul><li>Properties:</li></ul>high viscosity<br />
  7. 7. Runny Liquidat Boiling Point<br /><ul><li>Runny S8 Liquid</li></ul> at boiling point<br /> (445ºC)<br /><ul><li>Particle:</li></ul> Liquid<br /><ul><li>Forces:</li></ul> Van der Waals’<br />force<br /><ul><li>Properties:</li></ul>medium viscosity<br />
  8. 8. Formation of Plastic Sulphur<br />
  9. 9. Properties of Sulphur<br /><ul><li>Sulphur has various allotropic forms.
  10. 10. Below 95.6oC</li></ul> stable crystal form is rhombic.<br /><ul><li>Above 95.6oC</li></ul> element transforms into a triclinic form.<br /> These crystalline forms both contain cyclic S8 molecules.<br /><ul><li>Above melting point (113oC)</li></ul> molten Sulphur is a yellow liquid containing S8.<br />
  11. 11. Sulphur Transformation<br />
  12. 12. Properties of Sulphur<br /><ul><li>At 160oC</li></ul> Sulphur atoms form chains,<br /> liquid becomes more viscous & dark brown.  <br /><ul><li>At 180oC</li></ul> brown & viscous Sulphur liquid.<br /><ul><li>At 200oC</li></ul> Sulphur chains shorten.<br /><ul><li>At boiling point (445oC)</li></ul> viscous Sulphur becomes fluid again.<br /><ul><li>Into the cold water (0oC ~ 20oC)</li></ul> liquid Sulphur  rubber-like plastic Sulphur.<br />
  13. 13. THANK YOU <br />

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