Chapter 21:Hydrogen and water

Hydrogen(H2)

  • Simplest molecule made up of two hydrogen atoms joined together by a single covalent bond

Test for hydrogen

  • With a rlighted splinter, hydrogen gas makes a pop sound. It burns with a blue flame and produces water.

Water

  • Compound made up of two hydrogen and one oxygen.

Uses of water

  • Essential for life
  • Cooling power stations
  • Drinking
  • Domestic uses
  • Manufacturing of drinks
  • for body activity
  • Metabollic reactions

Testing for water

  • Add to white anhydrous copper(II) sulphate Which turns blue only with water.

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Water pollution

  • Fertilizers drained into rivers and streams
  • Oil spillage in sea
  • Industrial discharge
  • Bad sanitation
  • algae growth

Water purification

  • Filtered through beds of gravel and eventually sand to remove any fine solid particles.
  • Water is chlorinated to kill harmful bacteria sometimes
  • Flouride salts are added to prevent tooth decay.

Desalination

  • Conversion of sea water into drinking water.
  • Solar desalination is polular and is easy and cheap.

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