Air

Composition of Clean Air

Rusting

Common pollutants in the Air

Nitrogen (78%)

Oxygen (21%)

Small quantities of noble gases, water vapor, carbon dioxide

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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.

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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.

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