CFCS

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.

Tags

NGSS.HS-PS4-4

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

Tags

NGSS.HS-PS1-5

NGSS.HS-PS4-3

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

• Montreal Protoccol

• Kyoto Protoccol

• Paris Agreement

• Yo MaMa

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.

Tags

NGSS.HS-ESS3-4

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

• 5,000

• 10,000

• 50,000

• 100,000

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-5

Which chemical that replaced CFCs in refrigerants is now a concern as a major greenhouse gas?

• CFCs

• HFCs

• DDT

• CFCl2

Tags

NGSS.HS-ESS3-5

Which statement regarding the decreased level of stratospheric ozone is correct?

• Increased photosynthetic activity has been measured in the phytoplankton around Antarctica

• The largest decrease in the level of stratospheric ozone over the Arctic region occurs between January and April

• Although the Montreal Protocol led to a reduction in the use of CFCs, it will have little effect on stratospheric ozone levels in the long term

• There is no correlation between the incidence of cataracts and skin cancers and the lower level so stratospheric ozone

• The global crop yields of wheat, rice, and corn have increased since the reduction in CFC use

Through international cooperation, the concentration of chlorine in the atmosphere

• has already decreased below 3ppb

• will stabilize around 3ppb by 2030

• has stabilized at 5ppb

• is expected to stabilize at 5ppb by 2100

Which is NOT a result of the reduction in stratospheric ozone?

• reduced photosynthetic activity

• increased skin cancer

• increased likelihood of cataracts

• increased birth defects

Tags

NGSS.HS-PS4-3