Exam 1 CHEM 1100
Student:
___________________________________________________________________________
1. A substance that can be broken down into two or more simpler substances by chemical methods is
called a(n)
A. mixture.
B. compound.
C. element.
D. isotope.
2. Which substance is not considered to be an air pollutant?
A. N2
B. SO2
C. NO2
D. O3
3. Which statement is correct?
A. UV-A is the most energetic of the three forms of UV light.
B. UV-C is the most energetic of the three forms of UV light.
C. UV-B is the most energetic of the three forms of UV light.
D. UV-A, UV-B, and UV-C are equally energetic.
4. The ozone hole is most prominent on the Earth over
A. Africa.
B. Antarctica.
C. Europe.
D. North America.
5. The two chemical bonds and geometry of water are best represented by:
A.
B.
C.
D.
6. How many protons, neutrons, and electrons are there in the neutral atom of
?
A. B
B. C
C. A
D. D
7. Ethanol (C2H6O) is a common intoxicant and fuel produced from the fermentation of various grains.
How many moles of ethanol are represented by 50.0 kg of ethanol?
A. 46.1 mol
B. 1.09 mol
C. 9.00 mol
D. 1.09  103 mol
8. What is the coefficient for oxygen in the balanced chemical equation for the combustion of heptane
(C7H16)? Unbalanced equation: C7H16 + O2  CO2 + H2O
A. 8
B. 11
C. 1
D. 7
9. Increasing wavelength of light goes in this order:
A. ultraviolet > infrared > visible.
B. infrared > visible > ultraviolet.
C. visible > infrared > ultraviolet.
D. ultraviolet > visible > infrared.
10. Ozone in our atmosphere is important because it
A. reacts with excess CO2.
B. absorbs some UV radiation.
C. helps trees grow.
D. reflects IR radiation.
11. The most numerous of the elements are the
A. non metals.
B. noble gases.
C. metals.
D. metalloids.
12. Which is not a pure substance?
A. copper wire
B. sucrose
C. air
D. helium
13. What distinguishes the atoms of one element from another?
A. the number of protons plus neutrons
B. the number of protons
C. the number of neutrons
D. the number of neutrons plus electrons
14. Which explanation accounts for the fact that, on average, cloudy nights are warmer than clear
nights?
A. Clouds reflect light incoming from the moon.
B. Clouds have a high concentration of carbon dioxide from fossil fuel combustion.
C. H2O does not absorb infrared energy.
D. Clouds are composed of water vapor and H2O is a strong greenhouse gas.
15. Which diagram(s) best represent(s) only molecules?
A. III only
B. II only
C. IV only
D. I only
E. I and II only
16. How many atoms are present in 0.375 mol of palladium (Pd) atoms?
A. 2.12  1021
B. 6.02  1023
C. 2.26  1023
D. 1.61  1024
17. The mass number of an isotope of an element is the
A. number of its protons.
B. sum of the number of its protons and neutrons.
C. sum of the number of its protons and electrons.
D. sum of the number of its protons, neutrons, and electrons.
18. Yellow light has a wavelength of 580 nm. What is the frequency of this light?
A. 5.17  105 s¯ 1
B. 5.17  1014 s¯ 1
C. 1.80  10¯ 7 s¯ 1
D. 2.39  10¯ 19 s¯ 1
19. HFCs may be used to replace CFCs. Which compound is a HFC?
A. CH2Cl CCl2F
B. CF3CH2F
C. CH2FCl
D. CHClF2
20. Which product of the ultraviolet decomposition of CFCs acts as the catalyst for ozone
decomposition?
A. fluorine atoms
B. oxygen atoms
C. chlorine atoms
D. hydrogen atoms
21. What is the primary component of an exhaled breath?
A. N2
B. O2
C. CO2
D. H2O
22. What is the relationship between stratospheric levels of atomic chlorine and ozone?
A. As chlorine increases, ozone increases.
B. As chlorine increases, ozone deceases.
C. As chlorine changes, the effect on the ozone level is unpredictable.
D. As chlorine changes, there is no effect of the ozone level.
23. Which symbol(s) represent(s) elements in the noble gas family?
A. X and Z
B. Q
C. Y
D. P and L
24. Octane (C8H18) is one of the principal components of gasoline. How many moles of CO 2 are
produced during the combustion of 3.0 mol of octane?
Unbalanced equation: C8H18 + O2  CO2 + H2O
A. 3.0
B. 24
C. 8.0
D. 26
25.
A.
B.
C.
D.
The chemical formula for dinitrogen monoxide is:
N2O
N2O2
N2O3
NO2
Exam 1 CHEM 1100 Key
1. A substance that can be broken down into two or more simpler substances by chemical methods is
called a(n)
A. mixture.
B. compound.
C. element.
D. isotope.
American - 001 Chapter... #29
2. Which substance is not considered to be an air pollutant?
A. N2
B. SO2
C. NO2
D. O3
American - 001 Chapter... #10
3. Which statement is correct?
A. UV-A is the most energetic of the three forms of UV light.
B. UV-C is the most energetic of the three forms of UV light.
C. UV-B is the most energetic of the three forms of UV light.
D. UV-A, UV-B, and UV-C are equally energetic.
American - 002 Chapter... #6
4. The ozone hole is most prominent on the Earth over
A. Africa.
B. Antarctica.
C. Europe.
D. North America.
American - 002 Chapter... #12
5. The two chemical bonds and geometry of water are best represented by:
A.
B.
C.
D.
American - 002 Chapter... #42
6. How many protons, neutrons, and electrons are there in the neutral atom of
?
A. B
B. C
C. A
D. D
American - 002 Chapter... #31
7. Ethanol (C2H6O) is a common intoxicant and fuel produced from the fermentation of various grains.
How many moles of ethanol are represented by 50.0 kg of ethanol?
A. 46.1 mol
B. 1.09 mol
C. 9.00 mol
D. 1.09  103 mol
American - 003 Chapter... #26
8. What is the coefficient for oxygen in the balanced chemical equation for the combustion of heptane
(C7H16)? Unbalanced equation: C7H16 + O2  CO2 + H2O
A. 8
B. 11
C. 1
D. 7
American - 003 Chapter... #23
9. Increasing wavelength of light goes in this order:
A. ultraviolet > infrared > visible.
B. infrared > visible > ultraviolet.
C. visible > infrared > ultraviolet.
D. ultraviolet > visible > infrared.
American - 002 Chapter... #32
10. Ozone in our atmosphere is important because it
A. reacts with excess CO2.
B. absorbs some UV radiation.
C. helps trees grow.
D. reflects IR radiation.
American - 002 Chapter... #14
11. The most numerous of the elements are the
A. non metals.
B. noble gases.
C. metals.
D. metalloids.
American - 001 Chapter... #32
12. Which is not a pure substance?
A. copper wire
B. sucrose
C. air
D. helium
American - 001 Chapter... #35
13. What distinguishes the atoms of one element from another?
A. the number of protons plus neutrons
B. the number of protons
C. the number of neutrons
D. the number of neutrons plus electrons
American - 002 Chapter... #24
14. Which explanation accounts for the fact that, on average, cloudy nights are warmer than clear
nights?
A. Clouds reflect light incoming from the moon.
B. Clouds have a high concentration of carbon dioxide from fossil fuel combustion.
C. H2O does not absorb infrared energy.
D. Clouds are composed of water vapor and H2O is a strong greenhouse gas.
American - 003 Chapter... #18
15. Which diagram(s) best represent(s) only molecules?
A. III only
B. II only
C. IV only
D. I only
E. I and II only
American - 001 Chapter... #48
16. How many atoms are present in 0.375 mol of palladium (Pd) atoms?
A. 2.12  1021
B. 6.02  1023
C. 2.26  1023
D. 1.61  1024
American - 003 Chapter... #12
17. The mass number of an isotope of an element is the
A. number of its protons.
B. sum of the number of its protons and neutrons.
C. sum of the number of its protons and electrons.
D. sum of the number of its protons, neutrons, and electrons.
American - 002 Chapter... #36
18. Yellow light has a wavelength of 580 nm. What is the frequency of this light?
A. 5.17  105 s¯ 1
B. 5.17  1014 s¯ 1
C. 1.80  10¯ 7 s¯ 1
D. 2.39  10¯ 19 s¯ 1
American - 002 Chapter... #53
19. HFCs may be used to replace CFCs. Which compound is a HFC?
A. CH2Cl CCl2F
B. CF3CH2F
C. CH2FCl
D. CHClF2
American - 002 Chapter... #9
20. Which product of the ultraviolet decomposition of CFCs acts as the catalyst for ozone
decomposition?
A. fluorine atoms
B. oxygen atoms
C. chlorine atoms
D. hydrogen atoms
American - 002 Chapter... #60
21. What is the primary component of an exhaled breath?
A. N2
B. O2
C. CO2
D. H2O
American - 001 Chapter... #5
22. What is the relationship between stratospheric levels of atomic chlorine and ozone?
A. As chlorine increases, ozone increases.
B. As chlorine increases, ozone deceases.
C. As chlorine changes, the effect on the ozone level is unpredictable.
D. As chlorine changes, there is no effect of the ozone level.
American - 002 Chapter... #20
23. Which symbol(s) represent(s) elements in the noble gas family?
A. X and Z
B. Q
C. Y
D. P and L
American - 001 Chapter... #41
24. Octane (C8H18) is one of the principal components of gasoline. How many moles of CO 2 are
produced during the combustion of 3.0 mol of octane?
Unbalanced equation: C8H18 + O2  CO2 + H2O
A. 3.0
B. 24
C. 8.0
D. 26
American - 003 Chapter... #24
25.
A.
B.
C.
D.
The chemical formula for dinitrogen monoxide is:
N2O
N2O2
N2O3
NO2
American - 001 Chapter... #52
Exam 1 CHEM 1100 Summary
Category
# of Questions
American - 001 Chapter...
8
American - 002 Chapter...
12
American - 003 Chapter...
5