Hydrogen

• FORMULA: H2 -> Diatomic gas
• What is the preparation of hydrogen?


  Reaction with zinc and hydrochloride acid.

  Copper sulfate solution is also added, acting as a catalyst. Hydrogen is collected by the downward displacement of water
• Draw the preparation of hydrogen diagram:

  Diagram:

  
• BALANCED SYMBOL EQUATION:

  Zn + 2HCl -> ZnCl2 + H2
• PHYSICAL PROPERTIES:

  1. Colourless
  2. Odourless gas
  3. Less dense than air
  4. Insoluble in water
  5. Neutral
• TEST FOR HYDROGEN:

  Lit splint, Squeaky Pop
• USES OF HYDROGEN:

  1. To fill meteorological balloons
  2. Hardening of oils to form solid fats (i.e margarine and butter)
  3. Has potential as clean fuel (burns in the air and produces water and heat)
• ADVANTAGES OF USING HYDROGEN AS A CLEAN FUEL:

  • Burn to produce fuel
  • Can be produced from electrolysis of water -> it is renewable
  • if electricity comes from a renewable source, hydrogen is conserved
  • Technology is advanced to store, supply and use hydrogen
• DISADVANTAGES OF USING HYDROGEN AS A CLEAN FUEL:

  • Flammable gas =, difficult to transport and store
  • May cause pollution -> most hydrogen comes from burning methane, releases greenhouse gas carbon dioxide, (Electricity comes from. Fossil fuel it also gives off carbon dioxide)
  • Hydrogen needed to fuel cells, stored under pressure or as a liquid expensive
  • Fuel cells are expensive