Air
Composition of Clean Air
Rusting
Common pollutants in the Air
Nitrogen (78%)
Oxygen (21%)
Small quantities of noble gases, water vapor, carbon dioxide
Carbon monoxide
Oxides of nitrogen
Sulfur dioxide
Source: Combustion of fossil fuels
Source: Incomplete combustion of carbon-containing substances
Source: Car engines
Makes acid rain, which can damage buildings and other life.
A Poisonous gas that combines with hemoglobin in red blood cells preventing them from carrying oxygen.
Respiratory problems. Also makes acid rain by combining with water vapor in the air.
Reducing Sulfur Dioxide Emissions
Reducing the amount of sulfur added into petrol and diesel.
Desulfurisation
Calcium oxide is passed through a scrubber. Any sulfur dioxide in the waste gas reacts with the calcium oxide to form calcium sulfate.
iron + water + oxygen = hydrated iron (III) oxide
Rust prevention
Oxidation of iron
Create a barrier between iron and oxygen and water so rusting does not occur.
Coating with plastic
Plating with non-reactive metal
Painting
Galvanization
Oil and grease
Sacrificial Protection
This method revolves on the idea that the metals higher up in the reactivity series will react in preference.
