Ozone (pretest)

When is ozone considered a pollutant?
a.
in the stratosphere
b.
in the mesosphere
c.
in the troposphere
d.
in the thermosphere

C. in the troposphere

How does the absorption of ultraviolet radiation by the ozone layer help sustain life?
a.
This process helps maintain the temperature of the Earth.
b.
It keeps a low level of harmful ultraviolet radiation from reaching living organisms.
c.
This process keeps ozone concentrations in the troposphere at lower levels.
d.
All of the above are true.

D. All of the above are true.

Which of the following is an ozone depleting substance (ODS)?
a.
ultraviolet radiation
b.
chlorofluorocarbon (CFC)
c.
biogeochemical cycle
d.
none of the above

b. chlorofluorocarbon (CFC)

Which of the following is a possible consequence of ozone layer depletion on living organisms?
a.
increased exposure to ground-level ozone
b.
decreased levels of ultraviolet radiation in the troposphere
c.
increased levels of ultraviolet radiation absorption in the stratosphere
d.
none of the above

A. increase exposure to ground level ozone.

Depletion to the ozone layer can cause changes to the biogeochemical cycles.

True

The troposphere contains 90% of the ozone in the atmosphere.

False

Halons contain halogens, which are highly reactive with oxygen

True

How do chlorofluorocarbons (CFCs) contribute to ozone depletion?
a.
chlorine atom (Cl) breaks apart the ozone molecule
b.
CFCs build up and block the filtering effects of the ozone layer
c.
chlorine atom (Cl) bonds to the ozone molecule and changes its chemical properties
d.
breaks off an oxygen atom (O) and attaches it to a hydroxide ion (OH) to form water

A. chlorine atom (CI) breaks apart the ozone molecule

Which of the following is a health risk associated with ground-level ozone?
a.
cataracts
b.
skin cancer
c.
respiratory illness
d.
all of the above

C. respiratory illness

Where are chlorofluorocarbons found?
a.
coolants
b.
the atmosphere
c.
solvents
d.
all of the above

D. all of the above