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GCSE RETAKE REVISION
Science C1

Hayley Bull

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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…

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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

Chemicals

Elements are the `building blocks' of all materials. There are over 100 elements and each one
is…

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Combustion

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
carbon.

Burning Fossil Fuels

Many of the pollutants in the atmosphere are produced through the combination of…

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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…

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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…

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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.

National choices

Here are just some…

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