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Difficulty: MediumGreenhouse Effect, Global Warming, and Ozone Layer Depletion

Match each atmospheric chemical species or pollutant listed on the left with its corresponding atmospheric role or environmental impact listed on the right.

  • Chlorofluorocarbons (CFCs)Undergoes solar UV photolysis to release chlorine free radicals that catalytically break down protective ozone molecules.
  • Carbon(IV) oxide (CO2\text{CO}_2)Acts as the primary anthropogenic absorber of Earth's re-radiated terrestrial infrared radiation in the lower troposphere.
  • Stratospheric ozone (O3\text{O}_3)Filters high-energy solar ultraviolet (UV-B and UV-C) radiation, protecting terrestrial life.
  • Methane (CH4\text{CH}_4)A potent greenhouse gas released naturally via anaerobic decomposition and enteric fermentation in ruminants.

Answer

Chlorofluorocarbons pair with solar UV photolysis releasing chlorine free radicals; Carbon(IV) oxide pairs with absorbing terrestrial infrared radiation in the lower troposphere; Stratospheric ozone pairs with filtering solar ultraviolet radiation; Methane pairs with being a potent greenhouse gas from anaerobic decomposition.
Each chemical species is accurately matched to its distinct atmospheric layer and chemical property: Chlorofluorocarbons photolyze into free radicals that destroy ozone, Carbon(IV) oxide absorbs Earth's infrared heat, Stratospheric ozone shields the surface from UV radiation, and Methane acts as a greenhouse gas from biological anaerobic processes.

Step-by-Step Solution

1
Identify the primary environmental mechanism associated with Chlorofluorocarbons (CFCs).
CFCs are photolyzed by UV light in the stratosphere, generating atomic chlorine radicals that deplete ozone.
CFC molecules are unreactive in the troposphere but breakdown under high-energy UV light in the stratosphere.
2
Determine the atmospheric function of Carbon(IV) oxide (CO2\text{CO}_2).
CO2\text{CO}_2 absorbs re-radiated heat (infrared radiation) emitted by Earth, causing tropospheric warming.
CO2\text{CO}_2 molecules possess vibrational modes that absorb thermal infrared wavelengths.
3
Determine the protective role of Stratospheric Ozone (O3\text{O}_3).
Stratospheric ozone absorbs biological harmful UV-B radiation.
The Chapman mechanism demonstrates how photolysis and reformation of ozone absorb solar UV light.
4
Identify the primary source and impact of Methane (CH4\text{CH}_4).
Methane is a strong greenhouse gas emitted from anaerobic habitats like wetlands and livestock digestion.
Methanogenic bacteria produce CH4\text{CH}_4 under anaerobic conditions.

Key Concept

Distinguishing the chemical roles and environmental impacts of atmospheric pollutants causing global warming versus those causing ozone layer depletion.
Estimated Time:1m 30s
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Topics

Greenhouse Effect, Global Warming, and Ozone Layer Depletion

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