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Question 1
This question is about gases in the atmosphere and atmospheric pollution. |
a) | Propane is a hydrocarbon which can used for cooking. Write a balanced chemical equation to show the complete combustion of propane (C3H8).
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b) | Oil contains carbon and some sulfur. When oil is burned, the products of combustion may be released into the atmosphere. Explain the environmental effects of releasing these products of combustion into the atmosphere.
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Question 2
This question is about atmospheric pollution and greenhouse gases. |
a) | Which of the following is a greenhouse gas? A argon B methane C oxygen D nitrogen
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b) | The graph below shows how the concentration of carbon dioxide in the atmosphere has varied since 1850. Describe how the levels in carbon dioxide in the atmosphere have varied since 1850.
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c) | Give one example of human activity which have contributed to the increase in carbon dioxide in the atmosphere.
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d) | Explain why scientists are concerned about the level of carbon dioxide in the atmosphere.
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Question 3
This question is about the gases released from the complete and incomplete combustion of fossil fuels. |
a) | Explain what is meant by the term 'incomplete combustion'.
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b) | Write a balanced symbol equation for the complete combustion of methane.
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c) | Acid rain is a negative effect of atmospheric pollution. |
c) i) | State the name of the gas released from fossil fuel power stations that can cause acid rain.
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c) ii) | Give two effects of acid rain.
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d) | Solar power is one form of renewable energy that helps reduce the amount of fossil fuels burned in power stations. Suggest two reasons why solar power may not be able to completely replace electricity from fossil fuels.
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Question 4
This question is about the level of carbon dioxide in the atmosphere. |
a) | Carbon dioxide is a greenhouse gas. Explain the effect of high levels of carbon dioxide in the atmosphere.
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b) | Tick one box in each row to show whether each activity increases or decreases the levels of carbon dioxide in the atmosphere.
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c) | Carbon dioxide is released from the process of respiration. State one other source of carbon dioxide in the atmosphere.
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Question 5
This question is about the levels of greenhouse gases in the atmosphere. |
a) | The table below shows how the level of carbon dioxide in the atmosphere has varied since 1850. Plot a graph to show how the level of carbon dioxide has varied since 1850. Model answer
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b) | Describe how the level of carbon dioxide in the atmosphere has varied since 1850.
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c) | Give one reason why carbon dioxide levels have increased since 1850.
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d) | Carbon dioxide is released when fossil fuels are burned. Write a balanced symbol equation for the combustion of pentane.
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e) | Open fires in homes can produce carbon monoxide when fuel is burned. |
e) i) | State why carbon monoxide is sometimes formed when fuel is burned.
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e) ii) | Explain why it is important to have a carbon monoxide detector.
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Question 6
This question is about the effects of atmospheric pollution. |
a) | Which of the following is a negative effect of high levels of carbon dioxide in the atmosphere? A acid rain B deforestation C greenhouse effect D global dimming
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b) | Which of the following is responsible for acid rain? A carbon dioxide B carbon monoxide C sulfur dioxide D methane
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c) | Explain what is meant by the term 'global dimming'.
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Question 7
This question is about the exhaust fumes of a car. Carbon monoxide (CO), and nitrogen oxides (NOx) are produced in a car engine when petrol is burned. |
a) | Explain how nitrogen oxides are produced in the car engine.
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b) | Cars are fitted with a device to partially remove these nitrogen oxides from the exhaust fumes. State the name of the device used to remove the nitrogen oxides from the exhaust fumes.
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c) | Give two examples of possible negative effects of releasing nitrogen oxides into the atmosphere.
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d) | Carbon monoxide reacts with nitrogen monoxide to form carbon dioxide and nitrogen. Write a balanced symbol equation for this reaction.
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