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Chemistry One
Pollutants in the air
Pollutants are chemicals that can harm the Enviournment and our health. They enter the atmosphere
as a result of human activity, e.g. burning fossil fuels.
Pollutants that harm the environment can also harm humans indirectly. For example, acid rain makes
the water in the rivers and lakes too acidic for plants and animals to survive. This is indirect impact
on our food chain and natural resources such as trees.…read more

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Data about pollution
Data is very important to scientists because it can be used to test a theory or explanation.
Variables- (factors that change), like volume of traffic and weather, affect concentrations
Elements are the `building blocks' of all materials. There are over 100 elements and each one
is made up of very tiny particles called atoms. All the atoms of a particular element are the
same and are unique to that element.
Each element is represented by a different chemical symbol, e.g.…read more

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Combustion is a chemical reaction which occurs when fuels burn, releasing energy as heat. For
combustion to take place, oxygen must be present. Coal is a fossil fuel that consists mainly of
Burning Fossil Fuels
Many of the pollutants in the atmosphere are produced through the combination of fossil fuels e.g. in
power stations, cars aeroplanes, ect.…read more

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Complete combustion
Fossil fuels such as petrol, diesel fuel, natural gas and fuel oil consist mainly of compounds called
hydrocarbons. A hydrocarbon contains only hydrogen and carbon atoms. So, when it is burned in
air, carbon dioxide and water (hydrogen oxide) is produced (complete combustion) Remember,
carbon dioxide is a pollutant!
Incomplete combustion
If a fuel is burned and is not enough oxygen in the air, carbon particulates ( C ) or carbon monoxide
(CO) may be produced. This is called incomplete combustion.…read more

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Because humans need to breathe in air to get oxygen, it is reasonable to assume that air quality will
have some effect on the body.
To find out exactly how air quality affects us, scientists look for correlations (patterns)that might link
a factor (e.g. a pollutant in the air) to an outcome ( e.g. a respiratory complaint like asthma).
Improving Air quality
Air pollution is everywhere. It affects everyone, so we all have a responsibility to reduce it.…read more

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In 1997 there was an international meeting about climate change in Kyoto, Japan. People from many
nations agreed to reduce CO² emissions, and targets were set for individual countries. The
governments of the countries are required to take appropriate measures to meet the targets.…read more


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