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.

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.