Ozone Layer and Depletion Practice

Distinguish ultraviolet protection and CFC-driven ozone depletion from climate warming.

SEC G3 Pure Chemistry 2027

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Which comparison between global warming and ozone depletion is correct?

Global warming involves infrared; ozone depletion increases ultraviolet exposure
Both issues concern only ultraviolet
Both issues are caused only by carbon monoxide
Ozone depletion traps infrared while global warming blocks ultraviolet

Which complete statement is correct?

Methane contributes to warming by absorbing IR; CFCs contribute to ozone depletion and increased UV exposure
Methane destroys ozone only; CFCs remove carbon dioxide
Carbon dioxide blocks UV only; ozone traps IR
Oxygen and nitrogen are the main greenhouse gases

How can a small amount of CFC-derived chlorine cause substantial stratospheric ozone loss?

CFCs absorb all infrared radiation only at ground level
Chlorine changes ozone into a storage form that provides exactly the same ultraviolet protection
Chlorine radicals are regenerated in an ozone-destruction cycle, so a radical can take part repeatedly
Each chlorine radical removes only one ozone molecule and then becomes permanently inert

Why is the stratospheric ozone layer important?

It prevents every wavelength of visible light reaching Earth
It converts all infrared radiation into nitrogen
It absorbs much harmful ultraviolet radiation before it reaches Earth's surface
It supplies all nitrogen used by plants

What initiates the ozone-depletion problem associated with CFCs?

CFCs turn every ozone molecule into methane at ground level
Their long lifetime means CFC molecules cannot be broken down by ultraviolet radiation in the stratosphere
Water removes all chlorine from CFCs before they reach the atmosphere
Ultraviolet radiation releases reactive chlorine species from CFC molecules in the stratosphere

Which statement about the ozone layer is correct?

It absorbs harmful ultraviolet radiation, and chlorine from CFCs breaks it down.
It traps heat, and carbon dioxide breaks it down.
It causes acid rain, and CFCs repair it.
It supplies oxygen for breathing, and methane destroys it.

Ozone Layer and Depletion Practice

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