Deck 7: Chlorofluorocarbons and the Ozone Layer

Question 1

Ozone-depleting substances typically contain this element

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

Answer 1

chlorine

Question 2

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

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

Answer 2

single

Question 3

Which molecule is used as a replacement for CFC?

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

Answer 3

all of the above

Question 4

Which type of radiation is the most energetic?

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

Question 5

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

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

Question 6

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 7

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

A) 1
B) 100
C) 1000
D) 100000

Question 8

What type of radiation has a wavelength of 350 nm?

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

Question 9

Which molecule absorbs UV-B radiation?

A) O₂
B) O₃
C) CO₂
D) NO₂

Question 10

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 11

What does one Dobson unit (DU) equal?

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

Question 12

What continent is the ozone hole located over?

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

Question 13

Which type of radiation is effective at damaging DNA?

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

Question 14

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 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 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 17

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