Reversible Reactions

• Contact process

  1. Sulfur burned in oxygen to produce sulfur dioxide

  2. Sulfur dioxide reacts with oxygen to produce sulfur trioxide

  3. Sulfur trioxide reacts with sulfuric acid to make oleum

  4. Oleum reacted with water to make sulfuric acid
• Fertiliser:

  • Added to soil to increase fertility for better crop growth
  • Contains compounds of nitrogen, potassium, and phosphorus
  • Nitrogenous fertiliser specifically contains nitrogen, essential for plant growth
• Haber process:

  • Industrial process producing ammonia from hydrogen and nitrogen
  • Reaction conditions: 450°C, 200 atm, iron catalyst
  • Reaction: 3 H₂ + N₂ = 2 NH3
• Reversible reaction:

  • Products can react together to reform the reactants
  • Denoted by the symbol =
• What is the contact process?

  The process used to make sulfuric acid from sulfur and water
• Ammonia is made from nitrogen gas and hydrogen gas
• The Haber Process combines nitrogen from the air with hydrogen derived mainly from natural gas into ammonia
• The reaction in the Haber Process is reversible, as indicated by the double-arrow in the equation