Question detail
Explain how the presence of CFCs in the atmosphere leads to ozone depletion.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Halogenoalkanes
Question
Explain how the presence of CFCs in the atmosphere leads to ozone depletion.
Answer
CFCs release chlorine radicals when they break down in the atmosphere, which then catalyze the decomposition of ozone (O3) into oxygen (O2), reducing the ozone layer's effectiveness in blocking UV radiation.
Explanation
This answer effectively demonstrates the cause (CFC breakdown), the mechanism (release of chlorine radicals), the effect (ozone decomposition), and the consequence (reduced UV protection), showcasing a comprehensive understanding of the topic.
Common mistake
Misunderstanding CFC Restrictions
Students often state that CFCs were banned solely because they deplete ozone without explaining the scientific evidence behind this decision.
To fix this, students should explain that the cause of the restrictions was the scientific evidence showing that CFCs release chlorine radicals in the atmosphere. This mechanism leads to the breakdown of ozone molecules, resulting in increased UV radiation reaching the Earth's surface, which can cause harmful effects such as skin cancer and environmental damage.
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