Effect of Heat on Sulphur

• Heat on sulphur is a physical change.

• When heated, it undergoes a series of changes in colour, form and viscosity at various temp.

115^oC                                         115 - 180^oC                        Beyond 180^oC

• Straw coloured liquid

• Eight atom rings

• S₈ rings slide over each other making the liquid mobile

Mew sulphur - S_m

• Dark brown viscous liquid

• Long chain molecules of sulphur

• Long chains entangle and liquid becomes viscous

A

ction of Heat on Sulphur

Stacking of Molecules in Rhombic and Monoclinic Sulphur

The shapes of rhombic and monoclinic sulphur are different because of the difference in the packing of molecules. Those both contain S₈ rings and the molecules are stacked differently as shown in the figure above.