Answers SNHS NV-Environmental ScienceLife and Earth's Crust

Ozone Answers

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

The chlorofluorocarbons act like ultraviolet radiation causing large amount of ozone to be produced.

The chlorine from the chlorofluorocarbons reacts with free molecules of oxygen causing a stop in ozone production.

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.

Chlorofluorocarbons absorb ultraviolet radiation, preventing the formation of ozone.

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

ultraviolet radiation

chlorofluorocarbon (CFC)

biogeochemical cycle

none of the above

Halons contain halogens, which are highly reactive with oxygen.

The ozone layer helps to sustain terrestrial life by __________.

absorbing incoming UV radiation

keeping levels of ozone in the troposphere low

maintaining the Earth's temperature structure

all of the above

How does the absorption of ultraviolet radiation by the ozone layer help sustain life?

This process helps maintain the temperature of the Earth.

It keeps a low level of harmful ultraviolet radiation from reaching living organisms.

This process keeps ozone concentrations in the troposphere at lower levels.

All of the above are true.

Ozone is formed when _______.

two oxygen molecules combine

an individual oxygen atom combines with an oxygen molecule

ultraviolet radiation breaks apart four oxygen molecules

oxygen molecules are broken into separate atoms

How does the ozone layer affect life on Earth?

causes respiratory illness

increases photosynthesis in plants

causes damage to living tissue

filters out harmful ultraviolet radiation

How do chlorofluorocarbons (CFCs) contribute to ozone depletion?

chlorine atom (Cl) breaks apart the ozone molecule

CFCs build up and block the filtering effects of the ozone layer

chlorine atom (Cl) bonds to the ozone molecule and changes its chemical properties

breaks off an oxygen atom (O) and attaches it to a hydroxide ion (OH) to form water

Where are chlorofluorocarbons found?

coolants

the atmosphere

solvents

all of the above

How are individual atoms of oxygen formed in the stratosphere?

Individual oxygen atoms are formed when oxygen molecules collide with each other.

Individual oxygen atoms are formed in the sun.

Individual oxygen atoms are formed during photosynthesis.

Individual oxygen atoms are formed when UV rays strike oxygen molecules.

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