Water
Chemical test of water
1) Anhydrous (no water) copper (II) sulfate (s)
White to blue
2) Anhydrous cobalt (II) chloride paper
Blue to pink
Water
-
~ 70% of Earth is water
~ 97% is in the oceans
From rainfall
Raw water needs treatment
Layers of
sand and
gravel.
Removal of
large pieces
of dirt.
large,
insoluble
particles to
settle to
the bottom.
Cl is poisonous
and so kills
microorganisms.
Air
Pollutants in the air
From fossil fuels :
1) Complete combustion
2) CO2
Incomplete combustion
3) CO
Burning of fossil fuels
4) SO2
5) NO2
Effect of air pollutants
Greenhouse gases - CO2, methane, CFCs
Contribute to :
global warming,
rising sea levels,
flooding,
acid rain
unpredictable weather.
Iron
• Iron in the presence of oxygen and water will rust.
Prevention to rusting
1) Painting
2) Oiling
3) Alloying
4) galvanising