AnswersSC332 Environmental Science BOzone

Ozone Answers

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How are individual atoms of oxygen formed in the stratosphere?

A
Individual oxygen atoms are formed when oxygen molecules collide with each other.
B
Individual oxygen atoms are formed in the sun.
C
Individual oxygen atoms are formed during photosynthesis.
D
Individual oxygen atoms are formed when UV rays strike oxygen molecules.
2
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Halons contain halogens, which are highly reactive with oxygen.

A
T
B
F
3

Ozone is formed when _______.

A
two oxygen molecules combine
B
an individual oxygen atom combines with an oxygen molecule
C
ultraviolet radiation breaks apart four oxygen molecules
D
oxygen molecules are broken into separate atoms
4

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

A
T
B
F
5

Over 95% of incoming UV-B radiation is absorbed in the stratosphere. Please select the best answer from the choices provided

A
T
B
F
6

Where are chlorofluorocarbons found?

A
coolants
B
the atmosphere
C
solvents
D
all of the above
7

Which of the following is an ozone depleting substance (ODS)?

A
ultraviolet radiation
B
chlorofluorocarbon (CFC)
C
biogeochemical cycle
D
none of the above
8

Why are small quantities of chlorofluorocarbons so harmful to the ozone layer?

A
The chlorofluorocarbons act like ultraviolet radiation causing large amount of ozone to be produced.
B
The chlorine from the chlorofluorocarbons reacts with free molecules of oxygen causing a stop in ozone production.
C
Free oxygen atoms can replace the chlorine in chlorine monoxide, releasing a free atom of chlorine which can then recombine with an oxygen atom in ozone, destroying more ozone.
D
Chlorofluorocarbons absorb ultraviolet radiation, preventing the formation of ozone.
9

How is good (stratospheric) ozone formed?

A
combining an oxygen molecule (O2) an atom of chlorine (Cl)
B
combining a single oxygen atom (O) with an oxygen molecule (O2)
C
combining two single oxygen atoms
D
breaking apart an oxygen molecule
10

The ozone layer helps to sustain terrestrial life by __________.

A
absorbing incoming UV radiation
B
keeping levels of ozone in the troposphere low
C
maintaining the Earth's temperature structure
D
all of the above
11

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
12

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
13

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.
14

The environmental and health risks associated with ground-level ozone are greater than the environmental and health risks associated with the depletion of the ozone layer.

A
T
B
F
15

How does the ozone layer affect life on Earth?

A
causes respiratory illness
B
increases photosynthesis in plants
C
causes damage to living tissue
D
filters out harmful ultraviolet radiation
16

When is ozone considered a pollutant?

A
in the stratosphere
B
in the mesosphere
C
in the troposphere
D
in the thermosphere

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