Plastic Sulphur<br />Green Bay High School<br />Year 12<br />RACHEL SONG<br />
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 />
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 />
Properties of Sulphur<br /><ul><li>Sulphur has various allotropic forms.
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 />