Air Pollution — Chapter Summary
Telangana Open School (TOSS) · Class 12 · Chemistry
Summary of Air Pollution for Telangana Open School (TOSS) Class 12 Chemistry. Part of the Telangana Open School (TOSS) Class 12 Chemistry syllabus.
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Overview
Air is essential for life, but human activities are releasing harmful substances into the atmosphere, leading to air pollution. This chapter explores the composition of air, natural cycles like carbon and nitrogen, and how human actions disrupt these cycles. It also explains major air pollutants, th
Key Concepts
Clean air is made up
Clean air is made up of 78% nitrogen, 21% oxygen, 0.035% carbon dioxide, and trace amounts of other gases like argon, methane, and ozone. Water vapor
Carbon moves between the atmosphere
Carbon moves between the atmosphere, living organisms, and the earth through photosynthesis (plants absorb CO₂), respiration (organisms release CO₂),
Nitrogen gas (N₂) is converted into
Nitrogen gas (N₂) is converted into usable forms like nitrates by nitrogen-fixing bacteria. Plants use these to make proteins, which pass through food
Greenhouse gases like CO₂
Greenhouse gases like CO₂, CH₄, and CFCs trap heat in the atmosphere by absorbing and re-radiating infrared radiation. This leads to a rise in Earth's
CFCs from refrigerants and aerosols rise
CFCs from refrigerants and aerosols rise to the stratosphere, where UV radiation breaks them down, releasing chlorine atoms. Chlorine destroys ozone (
Learning Objectives
- Explain the composition of air
- Define air pollution
- Describe respiration, photosynthesis, and decay in the carbon cycle
- Identify major air pollutants and their sources
- Understand the link between fossil fuel burning and oxygen depletion
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Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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