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More Chemistry Questions


1.
Which has the greater N–O bond length, NO2 or NO3?
A)
NO2
B)
NO3
C)
The bond lengths are the same.
D)
More information is needed.
E)
None of these (A-D).
2.
Nitrous oxide (N2O, skeleton N-N-O) has three resonance structures. Based on an analysis of these three structures, including formal charges, the most likely N-N bond length is
Bond
average length
N-N
0.167 nm
N=N
0.120 nm
NN
0.110 nm
A)
0.110 nm
B)
0.112 nm
C)
0.120 nm
D)
0.136 nm
E)
0.167 nm
3.
The energy sequence of the molecular orbitals in OF is s2ss2s*s2pp2pp2p*s2p* . The cation OF1+ is predicted by simple molecular orbital theory to be __________ and _____________.
A)
unstable, diamagnetic
B)
unstable, paramagnetic
C)
stable, diamagnetic
D)
stable, paramagnetic
4.
The head-on, out of phase,  overlap of atomic p-orbitals in this fashion: yields the molecular orbital
A)
s
B)
s*
C)
p
D)
p*
5.
Consider a hypothetical molecule with the skeleton structure N-O-N.  In the most reasonable of the possible Lewis structures, the molecule has ______, and is likely to be ______.
A)
two double bonds, stable
B)
two double bonds, unstable
C)
a single bond and a triple bond, stable
D)
a single bond and a triple bond, unstable
6.
Which of the molecules below would you expect to have the highest boiling point?
 
        I                        II                         III                     IV
———————————————————————————
A)
I
B)
II
C)
III
D)
IV
E)
II and IV
Usethe following to answer questions 7-9:
Considerthe molecule and the following hybridization choices:
                      H2N-N=CH-C≡CH
        atom #           1          2             3     
7.
What is the hybridization of the nitrogen atom that is single-bonded to nitrogen and two hydrogen atoms (#1)?
A)
sp
B)
sp2
C)
sp3
D)
dsp3
E)
d2sp3
8.
What is the hybridization of the carbon atom that is single bonded to hydrogen and triple bonded to carbon (#3)?
A)
sp
B)
sp2
C)
sp3
D)
dsp3
E)
d2sp3
9.
What is the hybridization of the carbon atom that is double bonded to nitrogen (#2)?
A)
sp
B)
sp2
C)
sp3
D)
dsp3
E)
d2sp3
10.
The energy sequence of the molecular orbitals in C2 is s2ss2s*p2ps2pp2p*s2p* .  The bond order for the C2-1 anion is
A)
0
B)
1
C)
1.5
D)
2
E)
2.5
Usethe following to answer questions 11-12:
Drawthe Lewis structures of the molecules below and use them to answer thefollowing questions:
 I.
BH3
II.
NO2-1
III.
SF6
IV.
SO3
V.
PCl5
11.
Which of these molecules show resonance?
A)
I, II
B)
II, IV
C)
II, V
D)
III, IV
E)
III, V
12.
How many of the molecules have no dipole moment?
A)
1
B)
2
C)
3
D)
4
E)
They are all polar.
13.
In the molecular ion OF-1, the lone pair electrons on the fluorine are in
A)
p orbitals
B)
sp orbitals
C)
sp2 orbitals
D)
sp3 orbitals
14.
Which of the following ionic compounds has the smallest lattice energy (i.e., the lattice energy least favorable to a stable lattice)?
A)
LiF
B)
CsI
C)
NaCl
D)
BaO
E)
MgO
15.
The molecule H-N=N-H is __________ and the molecular cation H2N=O+ is _________.
A)
linear, planar
B)
planar, nonplanar
C)
nonplanar, planar
D)
planar, planar
E)
linear, nonplanar
16.
The in-phase sideways overlap of atomic p-orbitals leads to this molecular orbital:
A)
s
B)
s*
C)
p
D)
p*
17.
Consider the molecule ClF5.  The electronic geometry is __________ and the molecular geometry is __________.
A)
pentagonal, octahedral
B)
trigonal bipyramidal, trigonal bipyramidal
C)
octahedral, tetrahedral
D)
tetrahedral, trigonal pyramidal
E)
octahedral,  square pyramidal
18.
Which of the following has the smallest radius?
A)
F
B)
Ne
C)
O2–
D)
Mg2+
E)
Na+

 
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Posted by on December 21, 2011 in answers, atoms, chemistry, geology, molecules, nitrogen, oxides, school

 

More Chemistry Questions


1.
Which has the greater N–O bond length, NO2 or NO3?
A)
NO2
B)
NO3
C)
The bond lengths are the same.
D)
More information is needed.
E)
None of these (A-D).
2.
Nitrous oxide (N2O, skeleton N-N-O) has three resonance structures. Based on an analysis of these three structures, including formal charges, the most likely N-N bond length is
Bond
average length
N-N
0.167 nm
N=N
0.120 nm
NN
0.110 nm
A)
0.110 nm
B)
0.112 nm
C)
0.120 nm
D)
0.136 nm
E)
0.167 nm
3.
The energy sequence of the molecular orbitals in OF is s2ss2s*s2pp2pp2p*s2p* . The cation OF1+ is predicted by simple molecular orbital theory to be __________ and _____________.
A)
unstable, diamagnetic
B)
unstable, paramagnetic
C)
stable, diamagnetic
D)
stable, paramagnetic
4.
The head-on, out of phase,  overlap of atomic p-orbitals in this fashion: yields the molecular orbital
A)
s
B)
s*
C)
p
D)
p*
5.
Consider a hypothetical molecule with the skeleton structure N-O-N.  In the most reasonable of the possible Lewis structures, the molecule has ______, and is likely to be ______.
A)
two double bonds, stable
B)
two double bonds, unstable
C)
a single bond and a triple bond, stable
D)
a single bond and a triple bond, unstable
6.
Which of the molecules below would you expect to have the highest boiling point?
 
        I                        II                         III                     IV
———————————————————————————
A)
I
B)
II
C)
III
D)
IV
E)
II and IV
Use the following to answer questions 7-9:
Consider the molecule and the following hybridization choices:
                       H2N-N=CH-C≡CH
         atom #           1           2              3     
7.
What is the hybridization of the nitrogen atom that is single-bonded to nitrogen and two hydrogen atoms (#1)?
A)
sp
B)
sp2
C)
sp3
D)
dsp3
E)
d2sp3
8.
What is the hybridization of the carbon atom that is single bonded to hydrogen and triple bonded to carbon (#3)?
A)
sp
B)
sp2
C)
sp3
D)
dsp3
E)
d2sp3
9.
What is the hybridization of the carbon atom that is double bonded to nitrogen (#2)?
A)
sp
B)
sp2
C)
sp3
D)
dsp3
E)
d2sp3
10.
The energy sequence of the molecular orbitals in C2 is s2ss2s*p2ps2pp2p*s2p* .  The bond order for the C2-1 anion is
A)
0
B)
1
C)
1.5
D)
2
E)
2.5
Use the following to answer questions 11-12:
Draw the Lewis structures of the molecules below and use them to answer the following questions:
 I.
BH3
II.
NO2-1
III.
SF6
IV.
SO3
V.
PCl5
11.
Which of these molecules show resonance?
A)
I, II
B)
II, IV
C)
II, V
D)
III, IV
E)
III, V
12.
How many of the molecules have no dipole moment?
A)
1
B)
2
C)
3
D)
4
E)
They are all polar.
13.
In the molecular ion OF-1, the lone pair electrons on the fluorine are in
A)
p orbitals
B)
sp orbitals
C)
sp2 orbitals
D)
sp3 orbitals
14.
Which of the following ionic compounds has the smallest lattice energy (i.e., the lattice energy least favorable to a stable lattice)?
A)
LiF
B)
CsI
C)
NaCl
D)
BaO
E)
MgO
15.
The molecule H-N=N-H is __________ and the molecular cation H2N=O+ is _________.
A)
linear, planar
B)
planar, nonplanar
C)
nonplanar, planar
D)
planar, planar
E)
linear, nonplanar
16.
The in-phase sideways overlap of atomic p-orbitals leads to this molecular orbital:
A)
s
B)
s*
C)
p
D)
p*
17.
Consider the molecule ClF5.  The electronic geometry is __________ and the molecular geometry is __________.
A)
pentagonal, octahedral
B)
trigonal bipyramidal, trigonal bipyramidal
C)
octahedral, tetrahedral
D)
tetrahedral, trigonal pyramidal
E)
octahedral,  square pyramidal
18.
Which of the following has the smallest radius?
A)
F
B)
Ne
C)
O2–
D)
Mg2+
E)
Na+

 
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Posted by on December 20, 2011 in answers, atoms, chemistry, geology, molecules, nitrogen, oxides, school

 

Setting The Stage For Learning About The Earth

(These Answers Should Be Used as a Basis For Yours)
Exercise 1.1 Submergence Rate Along the Maine Coast
The rate of submergence is the total change in elevation of the pier 2 meters divided by the total amount of time involved 300 years and is therefore .67 cm/yr

Exercise 1.4  Sources of Heat for Earth Processes
A. The sand should be hot since the sun has been heating up the sand throughout the day.
i. When you dig your feet into the sand you should feel cooler sand since the sun’s penetration into the earth is limited.
ii. This suggests that the Sun can only penetrate into the Earth up until a certain depth.
iii.Based on this conclusion, one can assume that the Sun is not responsible for the Earth’s internal heat since, we have heat hundreds of kilometers within the Earth and this can not be explained with the Sun’s ray.
B. The geothermal gradient supports this conclusion because the deeper you get into the Earth the hotter it will get.

Exercise 1.6 The Challenge of Perspective and Visualizing Scale
A.
i. This flea is .0397 inches long
ii. The dog is 1000 times larger than the flea.
iii.The bar scale representing the flea is 1.35 cm long or .53inches
iv.The Bar would have to be 1,350cm long
B.
i. The earth is 640,000 larger than the geologist
ii.the drawing of the earth would have to be 281.6km long or 174.99 miles long.

Exercise 1.7 Moving Along
A. 8766 hours
i. 942,000,000km or 585,358,800miles
ii. its takes 8766 hours
iii. 107,460.64km/h or 66,776.04mph
iv. 1.074 x 10^5     or   6.676 x 10^4
B. 1674.67 km/hr  or 1040.64mph
C. The person standing in between the equator and the pole will be moving at a slower rate since the circumference of the earth is smaller compared to that on the equator meaning the earth has less distance to travel in a 24 hr time span.
D.
i. it would take 20000 sodium atoms 2 x 10^4
ii. the period is 4 orders of magnitude bigger than the atom.

Exercise 1.8 Scaling Down Features to Visualize Them
A. The U.K would have to be scaled down by six orders to make it fit on paper of 20cm long.

Exercise 1.9 Picturing Geologic Time
A.4.75 x 10^3 inches or 7.49 x 10^-2 miles or 1.21 x 10^-1 km
B. 5.28 x 10^4 years would represented by one second
3.173 x 10^6 years would be represented per minute.
1.9 x 10^8 years per hour
C.It would take 1.0×10^8 days to save a million
i. you would save $10,000 in a million yrs
   you would save $10 million in a billion years

Exercise 1.10 Rates of Mountain and Ocean Formation
A.
i. 1 meter high in 1000 yrs, 10,000 meters high in 10,000,000 years and 50,000 meters high in 50 million yrs.
ii. 1.96 x 10^-7 km/yr  or 1.96 x10^-4m/yr or 1.96 x 10^-1mm/yr
iii.1.47m/yr or 1466.67mm/yr
iv. it would take 44,000,000 to erode

Exercise 1.11 Thinking about Pressure in the Earth
B.the lithostatic pressure at 8km would be 2.75kb.

 
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Posted by on December 15, 2011 in answers, geology, intro to geology, ludman, marshak

 

Setting The Stage For Learning About The Earth

(These Answers Should Be Used as a Basis For Yours)
Exercise 1.1 Submergence Rate Along the Maine Coast
The rate of submergence is the total change in elevation of the pier 2 meters divided by the total amount of time involved 300 years and is therefore .67 cm/yr

Exercise 1.4  Sources of Heat for Earth Processes
A. The sand should be hot since the sun has been heating up the sand throughout the day.
i. When you dig your feet into the sand you should feel cooler sand since the sun’s penetration into the earth is limited.
ii. This suggests that the Sun can only penetrate into the Earth up until a certain depth.
iii.Based on this conclusion, one can assume that the Sun is not responsible for the Earth’s internal heat since, we have heat hundreds of kilometers within the Earth and this can not be explained with the Sun’s ray.
B. The geothermal gradient supports this conclusion because the deeper you get into the Earth the hotter it will get.

Exercise 1.6 The Challenge of Perspective and Visualizing Scale
A.
i. This flea is .0397 inches long
ii. The dog is 1000 times larger than the flea.
iii.The bar scale representing the flea is 1.35 cm long or .53inches
iv.The Bar would have to be 1,350cm long
B.
i. The earth is 640,000 larger than the geologist
ii.the drawing of the earth would have to be 281.6km long or 174.99 miles long.

Exercise 1.7 Moving Along
A. 8766 hours
i. 942,000,000km or 585,358,800miles
ii. its takes 8766 hours
iii. 107,460.64km/h or 66,776.04mph
iv. 1.074 x 10^5     or   6.676 x 10^4
B. 1674.67 km/hr  or 1040.64mph
C. The person standing in between the equator and the pole will be moving at a slower rate since the circumference of the earth is smaller compared to that on the equator meaning the earth has less distance to travel in a 24 hr time span.
D.
i. it would take 20000 sodium atoms 2 x 10^4
ii. the period is 4 orders of magnitude bigger than the atom.

Exercise 1.8 Scaling Down Features to Visualize Them
A. The U.K would have to be scaled down by six orders to make it fit on paper of 20cm long.

Exercise 1.9 Picturing Geologic Time
A.4.75 x 10^3 inches or 7.49 x 10^-2 miles or 1.21 x 10^-1 km
B. 5.28 x 10^4 years would represented by one second
3.173 x 10^6 years would be represented per minute.
1.9 x 10^8 years per hour
C.It would take 1.0×10^8 days to save a million
i. you would save $10,000 in a million yrs
   you would save $10 million in a billion years

Exercise 1.10 Rates of Mountain and Ocean Formation
A.
i. 1 meter high in 1000 yrs, 10,000 meters high in 10,000,000 years and 50,000 meters high in 50 million yrs.
ii. 1.96 x 10^-7 km/yr  or 1.96 x10^-4m/yr or 1.96 x 10^-1mm/yr
iii.1.47m/yr or 1466.67mm/yr
iv. it would take 44,000,000 to erode

Exercise 1.11 Thinking about Pressure in the Earth
B.the lithostatic pressure at 8km would be 2.75kb.

 
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Posted by on December 14, 2011 in answers, geology, intro to geology, ludman, marshak

 

Up From The Inferno 2 – Volcano

Question 1      
A 7.2 magnitude earthquake:
Correct Answer:
would have almost 33,000 times the energy release of a 4.2 quake.
       
Question 2      
Which statement is true?
Correct Answer:
Governments are supportive of the worldwide seismic network because it can detect nuclear bomb tests as well as natural earthquakes.
       
Question 3      
A tsunami:
Correct Answer:
may be just a broad, gentle swelling out at sea but grows as it approaches shore.
       
Question 4      
This diagram:
Correct Answer:
shows a displacement of 18 feet.
       
Question 5      
Earthquake prediction is not highly reliable, but geologists do know:
Correct Answer:
more earthquakes happen along plate boundaries than happen at intraplate locations.
       
Question 6      
Which statement is true? Liquefaction:
Correct Answer:
all of the above are true.
       
Question 7      
On the diagram shown:
Correct Answer:
Block X is the hanging wall.
       
Question 8      
Which statement is true?
Correct Answer:
R- and L-waves are surface seismic waves.
       
Question 9      
The locations of major earthquakes and volcanic eruptions:
Correct Answer:
are usually along the boundaries of crustal plates.
       
Question 10      
Which statement concerning tsunami events is false?
Correct Answer:
The velocity of a tsumani wave increases when the wave moves from open ocean into shallower water.
       
Question 11      
Identify the false statement: The Richter scale:
Correct Answer:
measures the size of a quake in terms of the damage it does (its intensity).
       
Question 12      
Identify the false statement.
Correct Answer:
Earthquake magnitude scales all run from one (minimum amplitude) to ten (maximum amplitude).
       
Question 13      
Identify the false statement.
Correct Answer:
Earthquakes never have hypocenters (foci) deeper than about 100 km (60 miles).
       
Question 14      
Which of the following is not a good technique for building earthquake-resistant structures?
Correct Answer:
Use concrete-block rather than wood-frame construction.
       
Question 15      
Identify the false statement. Long-term earthquake predictions:
Correct Answer:
are statements of the likelihood of an earthquake happening in some particular area within the next thousand years.
       
Question 16      
Interpret the travel-time curve shown. How many minutes between the arrival of the first P-wave and the arrival of the first S-wave?
Correct Answer:
7
       
Question 17      
Interpret the travel-time curve shown. Which line on the graph represents the S-wave?
Correct Answer:
upper line A
       
Question 18      
Interpret the travel-time curve shown. How far away is the earthquake epicenter?
Correct Answer:
350 mi
       
Question 19      
Interpret the travel-time curve shown. What time did the earthquake occur?
Correct Answer:
4:16 P.M.
       
Question 20      
Which of the following earthquake phenomena is the least likely to actually injure or kill humans?
Correct Answer:
ground shaking
       
Question 21      
Identify the false statement. Short-term earthquake prediction:
Correct Answer:
depends heavily on studying precursor phenomena like changes in water level in wells, gases, electrical conduction of rock, and animal behavior.
       
Question 22      
Identify the false statement. The tsunami event of Dec. 26, 2004:
Correct Answer:
could have resulted in an even greater death toll but for the timely warnings issued immediately after the quake.
       
Question 23      
The reading XIX is logical for a moderate-sized quake on the Mercalli intensity scale, which runs from X to XXX.
Correct Answer: False
       
Question 24      
Plotting the hypocenters (foci) of earthquakes, showing their progression from shallow to intermediate to deep as you move eastward across South America, is really drawing the profile of a subducting ocean plate.
Correct Answer: True
       
Question 25      
Roughly 80% of the earthquake energy released on Earth comes in the continental collision zone where the Himalayas are still growing; the remaining 20% is scattered at random locations worldwide.
Correct Answer: False
       
Question 26      
Although the risk is small, disastrous earthquakes can happen in regions that are not seismic zones.
Correct Answer: True
       
Question 27      
It takes less energy to activate an old fault than to create a comparably sized new one, so old faults must still be treated as areas of weakness vulnerable to earthquakes.
Correct Answer: True
       
Question 28      
If a rock undergoes enough stress to produce elastic strain, an earthquake always happens.
Correct Answer: False
       
Question 29      
Friction occurs between sliding surfaces because no surface can be perfectly smooth; all contain small bumps or protrusions.
Correct Answer: True
       
Question 30      
The New Madrid, Missouri, quakes of 1811-12 and the Charleston, South Carolina, quake of 1886 were both large intraplate quakes.
Correct Answer: True

Question 31      
Intermediate and deep-focus quakes occur in the Wadati-Benioff zones of divergent plate boundaries.
Correct Answer: False
       
Question 32      
Rayleigh seismic waves cause Earth’s surface to move vertically; Love seismic waves cause the ground to ripple back and forth, creating a snake-like movement of the surface.
Correct Answer: True
       
Question 33      
Because intraplate earthquakes are infrequent and tend to have shallow hypocenters, they have had little effect on human society.
Correct Answer: False
       

 

Up From The Inferno 2 – Volcano

Question 1      
A 7.2 magnitude earthquake:
Correct Answer:
would have almost 33,000 times the energy release of a 4.2 quake.
       
Question 2      
Which statement is true?
Correct Answer:
Governments are supportive of the worldwide seismic network because it can detect nuclear bomb tests as well as natural earthquakes.
       
Question 3      
A tsunami:
Correct Answer:
may be just a broad, gentle swelling out at sea but grows as it approaches shore.
       
Question 4      
This diagram:
Correct Answer:
shows a displacement of 18 feet.
       
Question 5      
Earthquake prediction is not highly reliable, but geologists do know:
Correct Answer:
more earthquakes happen along plate boundaries than happen at intraplate locations.
       
Question 6      
Which statement is true? Liquefaction:
Correct Answer:
all of the above are true.
       
Question 7      
On the diagram shown:
Correct Answer:
Block X is the hanging wall.
       
Question 8      
Which statement is true?
Correct Answer:
R- and L-waves are surface seismic waves.
       
Question 9      
The locations of major earthquakes and volcanic eruptions:
Correct Answer:
are usually along the boundaries of crustal plates.
       
Question 10      
Which statement concerning tsunami events is false?
Correct Answer:
The velocity of a tsumani wave increases when the wave moves from open ocean into shallower water.
       
Question 11      
Identify the false statement: The Richter scale:
Correct Answer:
measures the size of a quake in terms of the damage it does (its intensity).
       
Question 12      
Identify the false statement.
Correct Answer:
Earthquake magnitude scales all run from one (minimum amplitude) to ten (maximum amplitude).
       
Question 13      
Identify the false statement.
Correct Answer:
Earthquakes never have hypocenters (foci) deeper than about 100 km (60 miles).
       
Question 14      
Which of the following is not a good technique for building earthquake-resistant structures?
Correct Answer:
Use concrete-block rather than wood-frame construction.
       
Question 15      
Identify the false statement. Long-term earthquake predictions:
Correct Answer:
are statements of the likelihood of an earthquake happening in some particular area within the next thousand years.
       
Question 16      
Interpret the travel-time curve shown. How many minutes between the arrival of the first P-wave and the arrival of the first S-wave?
Correct Answer:
7
       
Question 17      
Interpret the travel-time curve shown. Which line on the graph represents the S-wave?
Correct Answer:
upper line A
       
Question 18      
Interpret the travel-time curve shown. How far away is the earthquake epicenter?
Correct Answer:
350 mi
       
Question 19      
Interpret the travel-time curve shown. What time did the earthquake occur?
Correct Answer:
4:16 P.M.
       
Question 20      
Which of the following earthquake phenomena is the least likely to actually injure or kill humans?
Correct Answer:
ground shaking
       
Question 21      
Identify the false statement. Short-term earthquake prediction:
Correct Answer:
depends heavily on studying precursor phenomena like changes in water level in wells, gases, electrical conduction of rock, and animal behavior.
       
Question 22      
Identify the false statement. The tsunami event of Dec. 26, 2004:
Correct Answer:
could have resulted in an even greater death toll but for the timely warnings issued immediately after the quake.
       
Question 23      
The reading XIX is logical for a moderate-sized quake on the Mercalli intensity scale, which runs from X to XXX.
Correct Answer: False
       
Question 24      
Plotting the hypocenters (foci) of earthquakes, showing their progression from shallow to intermediate to deep as you move eastward across South America, is really drawing the profile of a subducting ocean plate.
Correct Answer: True
       
Question 25      
Roughly 80% of the earthquake energy released on Earth comes in the continental collision zone where the Himalayas are still growing; the remaining 20% is scattered at random locations worldwide.
Correct Answer: False
       
Question 26      
Although the risk is small, disastrous earthquakes can happen in regions that are not seismic zones.
Correct Answer: True
       
Question 27      
It takes less energy to activate an old fault than to create a comparably sized new one, so old faults must still be treated as areas of weakness vulnerable to earthquakes.
Correct Answer: True
       
Question 28      
If a rock undergoes enough stress to produce elastic strain, an earthquake always happens.
Correct Answer: False
       
Question 29      
Friction occurs between sliding surfaces because no surface can be perfectly smooth; all contain small bumps or protrusions.
Correct Answer: True
       
Question 30      
The New Madrid, Missouri, quakes of 1811-12 and the Charleston, South Carolina, quake of 1886 were both large intraplate quakes.
Correct Answer: True

Question 31      
Intermediate and deep-focus quakes occur in the Wadati-Benioff zones of divergent plate boundaries.
Correct Answer: False
       
Question 32      
Rayleigh seismic waves cause Earth’s surface to move vertically; Love seismic waves cause the ground to ripple back and forth, creating a snake-like movement of the surface.
Correct Answer: True
       
Question 33      
Because intraplate earthquakes are infrequent and tend to have shallow hypocenters, they have had little effect on human society.
Correct Answer: False
       

 

A BIOGRAPHY OF THE EARTH

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Question 1
Which of the following is not useful in identifying mountain belts that have eroded away and therefore are not obvious topographic features?
Correct Answer:
shocked quartz

Question 2
Identify the false statement. There is very little rock record for Earth’s first 600 million years because:
Correct Answer:
the surface then was one huge ocean basin filled with hot water and nothing else.

Question 3
Which geologic time interval saw the first continents, the first life, and possibly the first plates?
Correct Answer:
Archean

Question 4
Which of the following has nothing to do with fossils?
Correct Answer:
Rodinia

Question 5
Which of the following statements is false? The first life forms:
Correct Answer:
probably occurred in oxygen-rich, shallow, warm ocean waters.

Question 6
Which of the following is not one of the smaller continents formed by the break up of Pannotia?
Correct Answer:
Laramide

Question 7
Which of the following are fossil plants?
Correct Answer:
gymnosperms and angiosperms

Question 8
Which of the following has nothing to do with the K-T (Cretaceous-Tertiary) boundary?
Correct Answer:
Thomas Huxley

Question 9
Which of the following statements is false?
Correct Answer:
Human ancestors first appeared in the late Mesozoic.

Question 10
This common, cheap, and useful form of limestone consists of microscopic marine algae shells and shrimp feces. Thick Cretaceous-age deposits of it are common in Europe.
Correct Answer:
chalk

Question 11
Identify the false statement. Internal differentiation:
Correct Answer:
“stirred” Earth’s interior and thus hastened Earth’s cooling.

Question 12
Which of the following was NOT a component of Earth’s Hadean atmosphere?
Correct Answer:
oxygen

Question 13
Identify the false statement.
Correct Answer:
80% of Earth’s continental crust existed by the end of the Hadean  eon.

Question 14
Identify the false statement. During the Pleistocene ice age:
Correct Answer:
continental glaciers covered all of North America.

Question 15
Identify the false statement.
Correct Answer:
Atmospheric oxygen and nitrogen react to form the nitrogen oxide that protects land life from harmful ultraviolet rays.

Question 16
Geologists believe the impact of a 10-km wide meteorite 65 million years ago:
Correct Answer:
all of the above are true statements.

Question 17
Rodinia, Pannotia, Grenville, and Pangaea are all names of supercontinents.
Correct Answer: False

Question 18
Banded-iron formations (BIFs) are forming today along mid-ocean ridges.
Correct Answer: False

Question 19
Gymnosperms (naked-seed plants like conifers) were widespread in the late Paleozoic; angiosperms (flowering plants) gained dominance in the late Mesozoic.
Correct Answer: True

Question 20
Theoretically “snowball Earth” of the late Proterozoic eon would have stayed ice-covered forever were it not for greenhouse warming caused by carbon monoxide from volcanoes.
Correct Answer: False

Question 21
It wasn’t until the late Mesozoic that vascular plants with woody tissues, seeds, and veins shared the land with spiders, scorpions, insects, and crustaceans, while jawed fish cruised the oceans and the first amphibians left water to visit land.
Correct Answer: False

Question 22
The Paleozoic era, like the Mesozoic era, may have ended with mass extinction of life forms due to a huge meteor impact.
Correct Answer: True

Question 23
The continents that comprised Pangaea came together in the early Paleozoic, but began to split apart soon afterward, during the late Paleozoic.
Correct Answer: False

Question 24
During the Hadean the Earth kept getting hotter due to meteorite impact and compression; radioactive elements didn’t yet exist to contribute heat energy.
Correct Answer: False

 
 
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