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Questions and Answers
What is the approximate percentage of nitrogen in dry air?
Ozone is a common atmospheric pollutant that is produced naturally by lightning activity.
False
What is the primary source of sulfur dioxide in the atmosphere?
Combustion of fossil fuels and volcanoes
The process of _______________________ regulates the amount of carbon dioxide in the atmosphere.
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Match the following pollutants with their primary sources:
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Methane is a greenhouse gas that may contribute to global cooling.
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Referring to the graph, what is the main constituent of the noble gases in dry air?
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Name two atmospheric pollutants that can be produced by internal combustion engines.
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What is the effect of 'acid rain' on respiration?
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How does the carbon cycle regulate the amount of carbon dioxide in the atmosphere?
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What is the primary source of methane, a greenhouse gas?
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What is a potential effect of increased levels of greenhouse gases in the atmosphere?
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Study Notes
Atmospheric Composition
- Dry air is composed of approximately 78% nitrogen, 21% oxygen, and 1% noble gases (mainly argon) and carbon dioxide.
Atmospheric Pollutants
- Common pollutants in the atmosphere include:
- Carbon monoxide
- Methane
- Nitrogen oxides (NO and NO2)
- Ozone
- Sulfur dioxide
- Unburned hydrocarbons
Sources of Pollutants
- Carbon monoxide is produced by:
- Incomplete combustion of carbon-containing substances
- Nitrogen oxides come from:
- Lightning activity
- Internal combustion engines
- Sulfur dioxide is released by:
- Volcanoes
- Combustion of fossil fuels
Effects of Pollutants
- Carbon monoxide is toxic
- Nitrogen dioxide and sulfur dioxide contribute to:
- Formation of acid rain
- Respiratory problems
- Damage to buildings
Carbon Cycle
- Processes involved in the carbon cycle:
- Combustion
- Respiration
- Photosynthesis
- The carbon cycle regulates the amount of carbon dioxide in the atmosphere
Greenhouse Gases
- Carbon dioxide and methane are greenhouse gases
- Sources of these gases:
- Human activities (fossil fuels, deforestation)
- Natural sources (respiration, decomposition)
- Potential effects of increased greenhouse gas levels:
- Extreme weather events
- Melting of polar ice
Atmospheric Composition
- Dry air is composed of approximately 78% nitrogen, 21% oxygen, and 1% noble gases (mainly argon) and carbon dioxide.
Atmospheric Pollutants
- Common pollutants in the atmosphere include:
- Carbon monoxide
- Methane
- Nitrogen oxides (NO and NO2)
- Ozone
- Sulfur dioxide
- Unburned hydrocarbons
Sources of Pollutants
- Carbon monoxide is produced by:
- Incomplete combustion of carbon-containing substances
- Nitrogen oxides come from:
- Lightning activity
- Internal combustion engines
- Sulfur dioxide is released by:
- Volcanoes
- Combustion of fossil fuels
Effects of Pollutants
- Carbon monoxide is toxic
- Nitrogen dioxide and sulfur dioxide contribute to:
- Formation of acid rain
- Respiratory problems
- Damage to buildings
Carbon Cycle
- Processes involved in the carbon cycle:
- Combustion
- Respiration
- Photosynthesis
- The carbon cycle regulates the amount of carbon dioxide in the atmosphere
Greenhouse Gases
- Carbon dioxide and methane are greenhouse gases
- Sources of these gases:
- Human activities (fossil fuels, deforestation)
- Natural sources (respiration, decomposition)
- Potential effects of increased greenhouse gas levels:
- Extreme weather events
- Melting of polar ice
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Description
Questions based on the composition of dry air and common atmospheric pollutants for N level students in Singapore.
