Someone curious
New member
1. Of the noble gases, __________ is present in highest concentration in dry air at sea level. (Points: 2)
Ne
He
Xe
Kr
Ar
2.
What is the partial pressure or oxygen (in torr) in the atmosphere when the atmospheric pressure is 760 torr? (Points: 2)
159
430
601
720
760
3. Of the compounds below, the one that requires the shortest wavelength for photoionization is __________. (Points: 2)
O
NO
They all require the same wavelength.
4. The C-Cl and C-F bond dissociation energies in CCl are 339 kJ/mol and 482 kJ/mol, respectively. The maximum wavelengths of electromagnetic radiation required to rupture these bonds are __________ and __________, respectively. (Points: 2)
45.0 nm, 307 nm
742 nm, 654 nm
482 nm, 248 nm
353 nm, 248 nm
979 nm, 953 nm
5. Why are chlorofluorocarbons so damaging to the ozone layer when they are such stable molecules? (Points: 2)
They contain a double bond that ozone readily attacks, resulting in the destruction of the ozone.
They are very light molecules that rapidly diffuse into the upper atmosphere and block the radiation that causes formation of ozone.
They are greenhouse gases that raise the temperature above the dissociation temperature of ozone.
The radiation in the stratosphere dissociates them producing chlorine atoms that catalytically destroy ozone.
CFCs do not damage the ozone.
6. Of the reactions involved in the photodecomposition of ozone (shown below), which are photochemical?
(Points: 2)
2 and 4
1, 2, and 4
1 and 3
1 only
all of them
7. CFC stands for (Points: 2)
chlorinated freon compound
chlorofluorocarbon
carbonated fluorine compound
caustic fluorine carbohydrate
carbofluoro compound
8. What is the typical pH of natural, unpolluted rainwater? (Points: 2)
7
6
9
12
5
9. What compound in limestone and marble is attacked by acid rain? (Points: 2)
hydroxyapatite
calcium carbonate
gypsum
graphite
potassium hydroxide
10. The source(s) of sulfur dioxide in the atmosphere is/are __________. (Points: 2)
volcanic gases
forest fires
bacterial action
fossil-fuel combustion
all of these
11. Of the following, only __________ does not result in the formation of acid rain. (Points: 2)
carbon dioxide
nitrogen dioxide
sulfur dioxide
nitrogen monoxide
methane
12. Why is carbon monoxide toxic? (Points: 2)
It causes renal failure.
It binds to hemoglobin, thus blocking the transport of oxygen.
It blocks acetylcholine receptor sites causing paralysis and rapid death.
It induces leukemia.
It binds to oxygen and causes suffocation.
13. Radiation in the infrared portion of the spectrum is absorbed by __________ found in the atmosphere. (Points: 2)
C
Ar
He
14. Incomplete combustion of carbon-containing materials occurs when __________. (Points: 2)
there is insufficient oxygen to convert all of the carbon to carbon dioxide
there are sulfur impurities in the carbon-containing material
the carbon-containing material is a gas
the combustion flame is too hot
there is an excess of oxygen
15. The brown color of photochemical smog over a city is mainly due to __________. (Points: 2)
N
CO
S
C
16. What is meant by the salinity of seawater? (Points: 2)
percent by mass of salt in seawater
mass in grams of dry salts present in 1 kg of seawater
molality of NaCl in seawater
osmotic pressure of seawater
molarity of NaCl in seawater
17. How many grams of sodium chloride are present in a 1-L sample of seawater that is 0.55 M in chloride ion and 0.47 M in sodium ion? (Points: 2)
47
27
32
100
60
18. In the presence of oxygen, the nitrogen present in biodegradable material ends up mainly as __________. (Points: 2)
N
NO
N
19. Chemical treatment of municipal water supplies commonly entails use of and . The purpose of adding CaO is to __________. (Points: 2)
remove all as solid
remove all as solid
remove all as solid
selectively kill anaerobic (but not aerobic) bacteria
make the water slightly basic so that addition of ( will afford a gelatinous precipitate of
20. Eutrophication o
Ne
He
Xe
Kr
Ar
2.
What is the partial pressure or oxygen (in torr) in the atmosphere when the atmospheric pressure is 760 torr? (Points: 2)
159
430
601
720
760
3. Of the compounds below, the one that requires the shortest wavelength for photoionization is __________. (Points: 2)
O
NO
They all require the same wavelength.
4. The C-Cl and C-F bond dissociation energies in CCl are 339 kJ/mol and 482 kJ/mol, respectively. The maximum wavelengths of electromagnetic radiation required to rupture these bonds are __________ and __________, respectively. (Points: 2)
45.0 nm, 307 nm
742 nm, 654 nm
482 nm, 248 nm
353 nm, 248 nm
979 nm, 953 nm
5. Why are chlorofluorocarbons so damaging to the ozone layer when they are such stable molecules? (Points: 2)
They contain a double bond that ozone readily attacks, resulting in the destruction of the ozone.
They are very light molecules that rapidly diffuse into the upper atmosphere and block the radiation that causes formation of ozone.
They are greenhouse gases that raise the temperature above the dissociation temperature of ozone.
The radiation in the stratosphere dissociates them producing chlorine atoms that catalytically destroy ozone.
CFCs do not damage the ozone.
6. Of the reactions involved in the photodecomposition of ozone (shown below), which are photochemical?
(Points: 2)
2 and 4
1, 2, and 4
1 and 3
1 only
all of them
7. CFC stands for (Points: 2)
chlorinated freon compound
chlorofluorocarbon
carbonated fluorine compound
caustic fluorine carbohydrate
carbofluoro compound
8. What is the typical pH of natural, unpolluted rainwater? (Points: 2)
7
6
9
12
5
9. What compound in limestone and marble is attacked by acid rain? (Points: 2)
hydroxyapatite
calcium carbonate
gypsum
graphite
potassium hydroxide
10. The source(s) of sulfur dioxide in the atmosphere is/are __________. (Points: 2)
volcanic gases
forest fires
bacterial action
fossil-fuel combustion
all of these
11. Of the following, only __________ does not result in the formation of acid rain. (Points: 2)
carbon dioxide
nitrogen dioxide
sulfur dioxide
nitrogen monoxide
methane
12. Why is carbon monoxide toxic? (Points: 2)
It causes renal failure.
It binds to hemoglobin, thus blocking the transport of oxygen.
It blocks acetylcholine receptor sites causing paralysis and rapid death.
It induces leukemia.
It binds to oxygen and causes suffocation.
13. Radiation in the infrared portion of the spectrum is absorbed by __________ found in the atmosphere. (Points: 2)
C
Ar
He
14. Incomplete combustion of carbon-containing materials occurs when __________. (Points: 2)
there is insufficient oxygen to convert all of the carbon to carbon dioxide
there are sulfur impurities in the carbon-containing material
the carbon-containing material is a gas
the combustion flame is too hot
there is an excess of oxygen
15. The brown color of photochemical smog over a city is mainly due to __________. (Points: 2)
N
CO
S
C
16. What is meant by the salinity of seawater? (Points: 2)
percent by mass of salt in seawater
mass in grams of dry salts present in 1 kg of seawater
molality of NaCl in seawater
osmotic pressure of seawater
molarity of NaCl in seawater
17. How many grams of sodium chloride are present in a 1-L sample of seawater that is 0.55 M in chloride ion and 0.47 M in sodium ion? (Points: 2)
47
27
32
100
60
18. In the presence of oxygen, the nitrogen present in biodegradable material ends up mainly as __________. (Points: 2)
N
NO
N
19. Chemical treatment of municipal water supplies commonly entails use of and . The purpose of adding CaO is to __________. (Points: 2)
remove all as solid
remove all as solid
remove all as solid
selectively kill anaerobic (but not aerobic) bacteria
make the water slightly basic so that addition of ( will afford a gelatinous precipitate of
20. Eutrophication o