9.1 - Stratospheric Ozone

Second layer of the atmosphere, extending about 17-48 kilometers above the earth’s surface. It contains a layer of gaseous ozone, which filters out about 95% of the incoming harmful ultraviolet radiation emitted by the sun

• Mesosphere
• Troposphere
• Stratosphere
• Ozone

Layer of gaseous ozone in the stratosphere that protects life on earth by filtering out most harmful ultraviolet radiation from the sun

• Greenhouse Gases
• Troposphere
• Stratosphere
• Ozone Layer

The breakdown of stratospheric ozone
I. can originate from the emission of chlorofluorocarbons (CFCs).
II. is catalyzed through a free chlorine (Cl) atom.
III. prevents UV rays from reaching the earth’s surface.

• I only
• III only
• I,&II
• I,II,& III

Which agreement allowed for a reduction, and eventual elimination, of CFC production and use?

• Montreal Protoccol
• Kyoto Protoccol
• Paris Agreement
• Yo MaMa

How do CFCs affect ozone production?

• UV radiation frees a chlorine atom, which breaks down ozone.
• Infrared radiation frees a chlorine atom, which breaks down ozone.
• UV radiation frees a fluorine atom, which breaks down ozone.
• Infrared radiation frees a chlorine atom, which breaks down ozone.

Depletion of ozone layer is a concern because it normally absorbs ____% of the sun's UV radiation. 

• 50
• 75
• 89
• 99

Which of these sets of three items produce CFCs

• cars, factories, and cardboard
• spray cans, cardboard, insulation
• spray cans, refrigerant, cardboard
• spray cans, refrigerant, insulation

Though CFC production has been curtailed, the threat to upper atmosphericozone continues because CFCs

• become harmless quickly.
• destroy ozone for only a short time.
• persist but stop destroying ozone.
• persist and continue to destroy ozone for decades.

When oxygen gas in the lower stratosphere is struck by this, it splits, leading to the formation of a ozone molecule.

• visible light
• ultraviolet radiation
• infrared
• gamma rays

How many ozone atoms can a single chlorine atom break down?

• 5,000
• 10,000
• 50,000
• 100,000