Sulfur Flashcards Preview

Chemistry > Sulfur > Flashcards

Flashcards in Sulfur Deck (5)
Loading flashcards...
1
Q

Name some sources of sulfur

A
  • Found uncombined with metals in ores such as
    + Zinc blende (ZnS) aka zinc sulfide
    + Galena (PbS) aka lead sulfide
  • Found in natural gas: hydrogen sulfide (H2S)
  • Sulfur dioxide
    + A colourless poisonous gas (burning fossil fuels)
    S + O2 => SO2
    + Can be made by roasting ores
    2ZnS + 3O2 => 2ZNO + 2SO2
2
Q

Name the main use of sulfur in the manufacture

of sulfuric acid

A

Sulfuric acid is used for:

  • Dtergents
  • Cleaning metals
  • Paints and dyes
  • Plastics
  • Phosphate fertilisers
3
Q

Name the uses of sulfur dioxide

A
  • As a bleach:
    + During the manufacture of paper from wood
    + Materials: silk, wool and straw
  • Preserve food and drinks by killing bacteria b/c it is an oxidising agent
    SO3 + 2H => SO2 + H20
4
Q

Describe the manufacture of sulfuric
acid by the Contact process, including
essential conditions

A
  • Sulphur burns in a furnace w/ air: S + O2 =>SO2
  • Cooled and reacted with excess air in a converter - contains 4 layers of a catalyst: vanadium oxide to form sulfur trioxide (temp: 450, press: 1 atm)
  • Sulfur trioxide reacts (endothermic) w/ water to form sulfuric acid in a mixture of 98% sulfuric acid and 2% water
    + SO3 +H20 => H2S04
5
Q

Describe the properties of dilute sulfuric

acid as a typical acid

A
  • Has a low pH

- Donate H+ ions (2 hydrogen ions that can react) => dibasic acid