Which equation correctly represents the formation of ozone in the upper atmosphere?
Show answer & explanation
Correct answer: B
Explanation
Correct Answer
O2 + UV → O + O; O + O2 → O3
Explanation
The formation of ozone (O3) in the upper atmosphere, specifically the stratosphere, occurs through a two-step process. In the first step, known as photodissociation, high-energy ultraviolet (UV) radiation from the sun breaks an oxygen molecule (O2) into two separate oxygen atoms (O). Following this, in the second step, these highly reactive oxygen atoms combine with other remaining oxygen molecules to form ozone (O3).
The other options are incorrect because they either represent faulty chemical reactions, such as the fission of carbon dioxide which is entirely unrelated to ozone formation, or they only depict other aspects of the oxygen cycle that do not clearly explain the complete process of ozone formation.
Key Points
Ozone formation primarily occurs in the Earth's upper stratosphere, and this entire process is driven by the sun's ultraviolet rays. The ozone layer performs the vital function of preventing harmful ultraviolet radiation from reaching the Earth's surface.
Important Questions and Answers
Question: In which layer of the atmosphere is the ozone layer primarily found?
Answer: Stratosphere.
Question: How many oxygen atoms are there in one molecule of ozone?
Answer: Three atoms (O3).
Would you like to learn more about the primary causes of ozone layer depletion?