Photochemistry

Definition

Photochemistry is the study of chemical reactions caused by light, particularly ultraviolet and visible radiation. It plays a critical role in the atmospheres of giant planets.

5 Must Know Facts For Your Next Test

1. Photochemical reactions in the giant planet atmospheres produce complex organic molecules.
2. Ultraviolet radiation from the Sun initiates photochemical processes in the upper atmospheres of giant planets.
3. Photochemistry can lead to the formation of hazes and clouds in planetary atmospheres.
4. Methane (CH4) and ammonia (NH3) are key molecules involved in photochemical reactions on Jupiter and Saturn.
5. The production of hydrocarbons like ethane (C2H6) and acetylene (C2H2) on Titan is driven by photochemistry.

Review Questions

• What role does ultraviolet radiation play in photochemistry on giant planets?
• How does photochemistry contribute to cloud formation in planetary atmospheres?
• Which molecules are primarily involved in photochemical reactions on Jupiter?

Related terms

Ultraviolet Radiation: High-energy electromagnetic waves that cause photochemical reactions.

Hydrocarbons: Organic compounds consisting entirely of hydrogen and carbon, often produced through photochemical processes.

Atmospheric Haze: A layer of particles formed through chemical reactions, including those driven by photochemistry.