Complete combustion Fuels burn when they react with oxygen in the air. The hydrogen in hydrocarbons is oxidised to water (remember that water, H2O, is an oxide of hydrogen).
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Card 7
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The test to show carbon dioxide is limewater it turns from clear to cloudy in the presence of carbon dioxide.
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Card 8
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Sulfur Most hydrocarbon fuels naturally contain some sulfur compounds. When the fuel burns, the sulfur it contains is oxidised to sulfur dioxide.
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Card 9
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The fossil fuels include coal, oil and natural gas. Various factors need to be considered when deciding how to use a fossil fuel.
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Card 10
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In general, solids such as coal are easier to store than liquids and gases. But they are often more difficult to light. Liquids and gases ignite more easily. They also flow, which means they can be transported through pipelines.
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Card 11
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Acid rain reacts with metals and rocks such as limestone. Buildings and statues are damaged as a result
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Card 12
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Sulfur can be removed from fuels at the oil refinery. This makes the fuel more expensive to produce, but it prevents sulfur dioxide being produced
