Plastic sulphur

Plastic Sulphur Green Bay High School Year 12 RACHEL SONG

What is Plastic Sulphur ? A form of rubber-like Sulphur - produced when molten Sulphur is rapidly poured into cold water. (It is only produced with red molten Sulphur that contains S8 chains.) 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. 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.

Steps of Change Yellow solid (20ºC ~ 25ºC) Yellow liquid (113ºC) Dark & extremely viscous liquid (118 ºC) Runny liquid at boiling point (445 ºC)

Yellow Solid ,[object Object], room temperature (20ºC ~ 25ºC) ,[object Object],Solid ,[object Object],Van der Waals’ force ,[object Object],powder

Yellow Liquid ,[object Object], at melting point (113ºC) ,[object Object], Liquid ,[object Object], Van der Waals’ force ,[object Object],low viscosity

Dark brown & extremely viscous Liquid ,[object Object], extremely viscous S8 Liquid at 180ºC ,[object Object], Liquid ,[object Object], Van der Waals’ force ,[object Object],high viscosity

Runny Liquidat Boiling Point ,[object Object], at boiling point (445ºC) ,[object Object], Liquid ,[object Object], Van der Waals’ force ,[object Object],medium viscosity

Properties of Sulphur ,[object Object]

Below 95.6oC stable crystal form is rhombic. ,[object Object], element transforms into a triclinic form. These crystalline forms both contain cyclic S8 molecules. ,[object Object], molten Sulphur is a yellow liquid containing S8.

Properties of Sulphur ,[object Object], Sulphur atoms form chains, liquid becomes more viscous & dark brown. ,[object Object], brown & viscous Sulphur liquid. ,[object Object], Sulphur chains shorten. ,[object Object], viscous Sulphur becomes fluid again. ,[object Object], liquid Sulphur  rubber-like plastic Sulphur.

Plastic sulphur

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Plastic sulphur