1. Allotropes
   1. found in many places
   2. released by volcanoes
   3. Compounds
      1. sulphides
   4. Allotrope :
      1. different forms
      2. same element
2. Rhombic Sulphur
   1. rhombus shaped crystals
   2. rings of 8
      1. S8
3. Monoclinic Sulphur
   1. created
      1. heat rhombic sulphur and cool
   2. long needle shaped crystal
   3. S8 molecules
   4. will change back into rhombic
4. Plastic Sulphur
   1. created
      1. heat until melting
      2. poor suddenly into cold water
      3. cooling rapidly
         1. crystals can not form
   2. flexible brown filament
   3. leave for a few days
      1. returns to rhombic sulphur
5. Sulphites
   1. dilute acid
   2. sulphur dioxide + water
      1. sulphurous acid
      2. H2SO3
   3. Sulphites
      1. salts of sulphurous acid
   4. sulphur dioxide
      1. sulphite + dilute acid
      2. K2SO3 (s) + 2HNO3(aq) ---> SO2 (g) + 2KNO3 + H2) (l)
      3. potassium sulphite + nitric acid ---> sulphur dioxide + potassium nitrite + water