Deck 7: Chlorofluorocarbons and the Ozone Layer

Question 1

What continent is the ozone hole located over?

A) Africa
B) Antarctica
C) Asia
D) North America

Answer 1

Antarctica

Question 2

What does the Chapman cycle illustrate?

A) the formation and destruction of water
B) the formation and destruction of carbon dioxide
C) the formation and destruction of nitrogen dioxide
D) the formation and destruction of ozone

Answer 2

the formation and destruction of ozone

Question 3

Which type of radiation is the most energetic?

A) UV-A
B) UV-B
C) UV-C
D) visible

Answer 3

UV-C

Question 4

What does one Dobson unit (DU) equal?

A) 1 ppb of ozone
B) 1 ppm of ozone
C) 100 ppb of ozone
D) 100 ppm of ozone

Question 5

Which type of radiation is effective at damaging DNA?

A) UV-A
B) UV-B
C) UV-C
D) visible

Question 6

Approximately how many ozone molecules can one chlorine atom derived from one CFC molecule react with?

A) 1 molecule O₃
B) 100 molecules O₃
C) 1000 molecules O₃
D) 100000 molecules O₃

Question 7

Which of the following explains why CFCs are not removed from the atmosphere by rainout?

A) CFCs are not water soluble.
B) CRCs are chemically inactive in the troposphere.
C) UV radiation removes them more quickly.
D) This is due to both their chemical stability and solubility in water.

Question 8

In the past, which of the following was not a source of atmospheric CFCs?

A) air-conditioning
B) aerosol sprays
C) refrigerants
D) blown foams
E) All of the above have been sources of atmospheric CFCs.

Question 9

Which molecule is used as a replacement for CFC?

A) HFC-134a
B) HCFC-123
C) HFC-152a
D) all of the above

Question 10

In a photochemical reaction,

A) the chemical reaction is energized by light.
B) nitrogen dioxide must be present.
C) ozone is always formed.
D) none of the above

Question 11

Which type of chemical bond requires the least amount of energy to break?

A) single
B) double
C) triple
D) quadruple

Question 12

Which molecule absorbs UV-B radiation?

A) O₂
B) O₃
C) CO₂
D) NO₂

Question 13

Why are scientists worried about the ozone hole?

A) increase in skin cancer
B) increase in plant growth
C) decrease in ocean temperature
D) all of the above

Question 14

Chlorofluorocarbons, such as CCl₂F₂, can cause problems in the upper atmosphere by destroying

A) nitrogen oxides.
B) oxygen.
C) ozone.
D) polynuclear hydrocarbons.

Question 15

What type of radiation is absorbed by molecular oxygen in the stratosphere?

A) UV-A
B) UV-B
C) UV-C
D) visible

Question 16

Why must the ozone layer in the stratosphere be protected?

A) ozone poisons incoming, unwanted aliens
B) ozone absorbs some incoming ultraviolet light
C) ozone burns up incoming meteorites
D) ozone prevents oxygen from escaping the earth

Question 17

Light with a wavelength of 350 nm is classified as UV-A.

Question 18

UV-A radiation has a shorter wavelength than UV-B radiation.

Question 19

What chemical bond is broken by a photon of light in a typical CFC molecule?

A) C-H
B) Cl-Cl
C) H-Cl
D) C-Cl

Question 20

Ozone-depleting substances typically contain which of the following elements?

A) oxygen
B) sulfur
C) nitrogen
D) chlorine

Question 21

Consider the following sequence of four reactions. Answer the following question using the number of the appropriate reaction. More than one reaction may be applicable to a given question. You need only enter one reaction.
The reaction that is identical to a reaction in the cycle by which CFCs destroy ozone is reaction________.

Question 22

The following sequence of reactions describes the destruction of ozone in the troposphere.

Question 23

Decreasing ozone concentrations are only observed over Antarctica.

Question 24

Consider the following sequence of four reactions. Answer the following question using the number of the appropriate reaction. More than one reaction may be applicable to a given question. You need only enter one reaction.
The reaction requiring a photon of the longest wavelength is reaction ______.

Question 25

More UV-A radiation reaches the Earth's surface than either UV-B or UV-C.

Question 26

Consider the following sequence of four reactions. Answer the following question using the number of the appropriate reaction. More than one reaction may be applicable to a given question. You need only enter one reaction.
In order to attain a steady state one reaction must counteract another in a cycle such as that shown. A reaction which could be used to consume ozone is reaction_______.

Question 27

Consider the following sequence of four reactions. Answer the following question using the number of the appropriate reaction. More than one reaction may be applicable to a given question. You need only enter one reaction.
A reaction that would serve to decrease the amount of oxygen is reaction ________.

Question 28

Consider the following sequence of reactions. The reason that low concentrations of CFCs can destroy major amounts of ozone is due to the production of a the reactive Cl species in this sequence.

Question 29

Consider the following sequence of four reactions. Answer the following question using the number of the appropriate reaction. More than one reaction may be applicable to a given question. You need only enter one reaction.
In order to attain a steady state one reaction must counteract another in a cycle such as that shown. The reaction which could be used to replace depleted ozone is reaction_______.