Welcome to the Quiz!
This quiz contains 7 questions from a mix of 1 subtopics.
Which of the following is a key feature of chlorofluorocarbons (CFCs)?
they contain only carbon and chlorine
they are flammable
they are highly reactive
they contain no C-H bonds
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What is the primary role of the ozone layer in the upper atmosphere?
to prevent air pollution
to absorb harmful ultraviolet radiation
to trap greenhouse gases
to reflect visible light
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What happens to CFC molecules when they reach the stratosphere?
they are carried back to the ground level
they are converted into greenhouse gases
they are broken down by UV radiation, releasing chlorine radicals
they react with ozone to form new compounds
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Which of the following reactions describes the breakdown of CFCs in the upper atmosphere by high-energy UV radiation?
CF3Cl ➔ CF3• + Cl
CF3Cl ➔ CF3• + Cl•
CF3Cl ➔ CF3 + Cl
CF3Cl ➔ CF3 + Cl•
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What is the main advantage of HFCs over CFCs?
they are less flammable
they do not harm the ozone layer
they decompose rapidly
they are not greenhouse gases
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The high stability of CFCs is a result of which strong type of bond?
carbon-carbon
carbon-oxygen
carbon-halogen
carbon-hydrogen
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What is the overall effect of the reactions between chlorine radicals and ozone?
O3 + ClO• ➔ Cl• + 2O2
O3 + Cl• ➔ ClO• + O2
2O3 ➔ 3O2
O3 ➔ O2 + O•
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