Name (PRINT clearly)
Exam 2 (100 points)
October 27, 2016
Chemistry 1303.003
On my honor, I have neither given nor received unauthorized aid on this exam.
Signed
Date
Write you answer in the blank. Only what is written CLEARLY in the blank will be graded!
1.
y
a. (4 points) Using the following labeled x and y axes on the right,
draw the orbital listed below the axes.
x
b. (2 points) Write the quantum number l for this orbital.
dxy orbital
l=
2.
(2 points) From
the following list,
are isoelectronic
Zn2+, Ar, Cl–, S, K+, Na+, Cu2+
3.
(2 points) There
are
4.
(4 points) Among
electrons in a subshell where l = 2.
the following,
are acids and
are bases in water.
C2H6, CO2, CH3OH, Rb2O, NH3, HClO
1. (2 points) Consider an element with the following electron configuration.
[Xe]6s24f5
This
element is classified as
a representative element, an actinide element , a noble gas, a lanthanide element, a nonmetal, an alkali
metal
5.
(2 points) The
complete ground state electron configuration for Cl is
6.
(2 points) The
shorthand ground state electron configuration of V3+ is
7.
(2 points) Among
the following types of radiation, the one with the lowest energy is
microwaves, radiowaves, UV, infrared, visible, x-rays
8.
(2 points) Among
P
the following, the one with 3 unpaired electrons is
Se
Cl
Mg
Ge2+
S2-
Fe3+
.
.
Page 2
9.
(2 points)
Among the following,
P
O
As
has the largest first ionization energy
Mg
Al
10. (2 points) Among the following,
Ca2+
11.
(2 points)
K+
S2-
As
S
has the smallest atomic radius
Cl–
I
From the following list of wavelengths for radiation,
has the
most energy.
550 m
12.
(4 points)
3000 nm
5.2 x 10-2 nm
2.0 x 1012 nm
6.0 x 108 m
0.40 nm
A sample of He gas has a volume of 15.7 L at 20 °C at 1.50 atm of pressure. The volume of the gas
when heated to 150 °C is
.
13. (2 points) When a balloon is filled with a mixture of nitrogen, neon, oxygen, and argon, the
will leak most rapidly through any small opening.
14. (4 points) The formation reaction for acetaminophen, C8H9NO3 (s) is
15. (2 points) Which of the following sets of quantum numbers (listed in order of n, l, ml, ms) best describes
the valence electron of highest energy in a ground-state gallium atom (atomic number 31) ? [Here you
may underline or circle your answer.]
4, 0, 0, ½
4, 0, 1, ½
4, 1, 1, ½
4, 1, 2, ½
4, 2, 0, ½
In the following problems, to receive any points, you must clearly and logically show how you arrive
at your answer. All UNITS must appear at all steps of the calculation. NO WORK, NO UNITS, NO
POINTS!
16. (5 points) Light with a wavelength of 1.20 x 104 nm will break a typical metal-metal bond.
What is this metal-metal bond energy in kJ/mol? SHOW ALL WORK, INCLUDING UNITS!
Page 3
18. (10 points) A new fluorocarbon material, prepared by an undergrad at a local university, is believed to be a diprotic
acid (call it H2A for short). A 0.860 g sample of this unknown acid was titrated (reaction below) with a 0.1025 M
solution of NaOH. In the titration, 38.50 mL of the NaOH solution was required to reach the endpoint.
Determine the molecular mass of the new acid. CLEARLY SHOW ALL WORK AND UNITS......
H2A
19. (6 points)
+
2 NaOH
→
Na2A
+
2 H2O
A 10.0 L volume of an ideal gas in a cylinder with a piston is at a pressure of 4 atm. Suddenly, enough
weight is removed from the piston to lower the external pressure to 1.5 atm thus allowing the gas to expand at
constant temperature. Calculate work, w, in L.atm, for this process. CLEARLY SHOW ALL WORK AND
UNITS......
Page 4
20. (10 points) A 1.0152 g sample of an iron ore that contained Fe3O4 (231.5 g/mole) was dissolved in acid and all of
the iron was converted to Fe2+. The solution was then titrated with 0.0281 M KMnO4 according to the following
net ionic equation. To reach the endpoint, 39.42 mL of the KMnO4 solution was required. Determine the
percentage by mass of Fe3O4 in the ore. CLEARLY SHOW ALL WORK AND UNITS......
5 Fe2+
+
MnO4
+
8 H+
→
5 Fe3+
+
Mn2+
+
4 H2O
21. (10 points) A 3.34 sample of Al reacts with excess HCl to produce hydrogen gas which is collected over
water at 25.0 °C at a pressure of 740 mmHg. If the vapor pressure of water at 25 °C is 23.76 mmHg,
what total volume of gas(es), in liters, is collected? CLEARLY SHOW ALL WORK AND UNITS......
2 Al (s)
+ 6 HCl (aq)
→ 2 AlCl3 (aq) + 3 H2 (g)
Page 5
22. (7 points) Liquid ClF3 can be prepared from gaseous ClF and F2. Given the following
information, calculate the heat of reaction, ∆H°rexn, for this method of preparing ClF3 (l).
CLEARLY SHOW ALL WORK and REASONING!
2 F2 (g) + O2 (g) → 2 OF2 (g)
∆H° = – 43.5 kJ
2 ClF3 (l) + 2 O2 (g) →
∆H° = 394.1 kJ
2 ClF (g) +
Cl2O (g) + 3 OF2 (g)
O2 (g) → Cl2O (g) + OF2 (g)
∆H° = 167.5 kJ
23. (10 points) When benzene, C6H6 (molar mass = 78.0 g/mol) is burned, the amount of heat released is 3273 kJ/mol.
Calculate the final temperature of a calorimeter containing 2000 g of water, when a 1.10 g sample of this
hydrocarbon is burned in the calorimeter that has an initial temperature of 22.4 °C. The heat capacity of the
calorimeter is 710 J/ °C.
CLEARLY SHOW ALL WORK AND UNITS......
Name (PRINT clearly)
Exam 2 (100 points)
October 27, 2016
Chemistry 1303.003
On my honor, I have neither given nor received unauthorized aid on this exam.
Signed
Date
Write you answer in the blank. Only what is written CLEARLY in the blank will be graded!
1
y
a. (4 points) Using the following labeled x and y axes on the right,
draw the orbital listed below the axes.
x
b. (2 points) Write the quantum number l for this orbital.
px orbital
l=
2.
3.
(4 points) The formation
reaction for acetaminophen, C8H9NO3(s) is
(2 points) From the following list,
are isoelectronic
Zn2+, Ar, Cl–, S, Br–, Na+, Ca2+
4.
5.
(2 points) There
are
electrons in a subshell where l = 2.
(4 points) Among the
following,
are acids and
are bases in water.
SO2, CH3OH, NH3, HBrO2, C3H8, SrO
6.
(2 points) Consider
an element with the following electron configuration.
[Xe]6s24f5 This element is
classified as
a representative element, an actinide element , a noble gas, a lanthanide element, a nonmetal, an alkali metal
7.
8.
(2 points) The
shorthand ground state electron configuration of Cr3+ is
(2 points) Among the
following types of radiation, the one with the lowest energy is
microwaves, radiowaves, UV, infrared, visible, x-rays
9. (2 points) Among the following, the one with 1 unpaired electrons is
P
Se
Cl
Mg
Ge2+
S2-
Fe3+
.
Page 2
10. (2 points) The complete ground state electron configuration for Si is
11.
(2 points)
Among the following,
P
O
has the largest first ionization energy
As
12. (2 points) Among the following,
Ca2+
13.
(2 points)
Ca
.
Mg
Al
S
has the largest atomic radius
S2-
Se2-
Cl–
K+
From the following list of wavelengths for radiation,
has the
least energy.
550 m
14.
(4 points)
3000 nm
5.2 x 10-2 nm
2.0 x 1012 nm
6.0 x 108 m
0.40 nm
A sample of He gas has a volume of 35.7 L at 20 °C at 1.5.0 atm of pressure. The volume of the gas
when heated to 150 °C is
.
15. (2 points) When a balloon is filled with a mixture of nitrogen, neon, helium, and argon, the
will leak most slowly through any small opening.
16. (2 points) Which of the following sets of quantum numbers (listed in order of n, l, ml, ms) best
describes the valence electron of highest energy in a ground-state gallium atom (atomic number 31) ?
[Here you may underline or circle your answer.]
4, 0, 0, ½
4, 0, 1, ½
4, 1, 1, ½
4, 1, 2, ½
4, 2, 0, ½
In the following problems, to receive any points, you must clearly and logically show how you arrive at
your answer. All UNITS must appear at all steps of the calculation. NO WORK, NO UNITS, NO
POINTS!
17. (6 points) A 25.0 L volume of an ideal gas in a cylinder with a piston is at a pressure of 5 atm. Suddenly,
enough weight is removed from the piston to lower the external pressure to 1.5 atm thus allowing the
gas to expand at constant temperature. Calculate work, w, in L.atm, for this process. CLEARLY
SHOW ALL WORK AND UNITS......
Page 3
18. (10 points) When benzene, C6H6 (molar mass = 78.0 g/mol) is burned, the amount of heat released is 3273 kJ/mol.
Calculate the final temperature of a calorimeter containing 2000 g of water, when a 1.50 g sample of this
hydrocarbon is burned in the calorimeter that has an initial temperature of 23.4 °C. The heat capacity of the
calorimeter is 710 J/ °C.
CLEARLY SHOW ALL WORK AND UNITS......
19. (10 points) A 1.2152 g sample of an iron ore that contained Fe3O4 (231.5 g/mole) was dissolved in acid and all of
the iron was converted to Fe2+. The solution was then titrated with 0.0281 M KMnO4 according to the
following net ionic equation. To reach the endpoint, 49.42 mL of the KMnO4 solution was required.
Determine the percentage by mass of Fe3O4 in the ore. CLEARLY SHOW ALL WORK AND UNITS......
5 Fe2+
+
MnO4
-
+
8 H+
→
5 Fe3+
+
Mn2+
+
4 H2O
Page 4
20. (10 points) A 2.34 sample of Al reacts with excess HCl to produce hydrogen gas which is collected
over water at 25.0 °C at a pressure of 740 mmHg. If the vapor pressure of water at 25 °C is 23.76
mmHg, what total volume of gas(es), in liters, is collected? CLEARLY SHOW ALL WORK AND
UNITS......
2 Al (s)
+ 6 HCl (aq)
→ 2 AlCl3 (aq) + 3 H2 (g)
21. (5 points) Light with a wavelength of 1.70 x 104 nm will break a typical metal-metal bond.
What is this metal-metal bond energy in kJ/mol? SHOW ALL WORK, INCLUDING UNITS!
Page 5
22. (10 points) A new fluorocarbon material, prepared by an undergrad at a local university, is believed to be a
diprotic acid (call it H2A for short). A 0.860 g sample of this unknown acid was titrated (reaction below) with a
0.1025 M solution of NaOH. In the titration, 38.50 mL of the NaOH solution was required to reach the endpoint.
Determine the molecular mass of the new acid. CLEARLY SHOW ALL WORK AND UNITS......
H2A
+
2 NaOH
→
Na2A
+
2 H2O
23. (7 points) Liquid ClF3 can be prepared from gaseous ClF and F2. Given the following
information, calculate the heat of reaction, ∆H°rexn, for this method of preparing ClF3 (l).
CLEARLY SHOW ALL WORK and REASONING!
2 ClF (g) +
O2 (g) → Cl2O (g) + OF2 (g)
2 ClF3 (l) + 2 O2 (g) →
Cl2O (g) + 3 OF2 (g)
2 F2 (g) + O2 (g) → 2 OF2 (g)
∆H° = 167.5 kJ
∆H° = 394.1 kJ
∆H° = -43.5 kJ
Name (PRINT clearly)
Exam 2 (100 points)
October 27, 2016
Chemistry 1303.003
On my honor, I have neither given nor received unauthorized aid on this exam.
Signed
Date
Write you answer in the blank. Only what is written CLEARLY in the blank will be graded!
1.
y
a. (4 points) Using the following labeled x and y axes on the right,
draw the orbital listed below the axes.
x
b. (2 points) Write the quantum number l for this orbital.
dxy orbital
l=
2.
(2 points) From
the following list,
are isoelectronic
Zn2+, Ar, Cl–, S, K+, Na+, Cu2+
3.
(2 points) There
are
4.
(4 points) Among
electrons in a subshell where l = 2.
the following,
are acids and
are bases in water.
C2H6, CO2, CH3OH, Rb2O, NH3, HClO
1. (2 points) Consider an element with the following electron configuration.
[Xe]6s24f5
This
element is classified as
a representative element, an actinide element , a noble gas, a lanthanide element, a nonmetal, an alkali
metal
5.
(2 points) The
complete ground state electron configuration for Cl is
6.
(2 points) The
shorthand ground state electron configuration of V3+ is
7.
(2 points) Among
the following types of radiation, the one with the lowest energy is
microwaves, radiowaves, UV, infrared, visible, x-rays
8.
(2 points) Among
P
the following, the one with 3 unpaired electrons is
Se
Cl
Mg
Ge2+
S2-
Fe3+
.
.
Page 2
9.
(2 points)
Among the following,
P
O
As
has the largest first ionization energy
Mg
Al
10. (2 points) Among the following,
Ca2+
11.
(2 points)
K+
S2-
As
S
has the smallest atomic radius
Cl–
I
From the following list of wavelengths for radiation,
has the
most energy.
550 m
12.
(4 points)
3000 nm
5.2 x 10-2 nm
2.0 x 1012 nm
6.0 x 108 m
0.40 nm
A sample of He gas has a volume of 15.7 L at 20 °C at 1.5.0 atm of pressure. The volume of the gas
when heated to 150 °C is
.
13. (2 points) When a balloon is filled with a mixture of nitrogen, neon, oxygen, and argon, the
will leak most rapidly through any small opening.
14. (4 points) The formation reaction for acetaminophen, C8H9NO3 is
15. (2 points) Which of the following sets of quantum numbers (listed in order of n, l, ml, ms) best describes
the valence electron of highest energy in a ground-state gallium atom (atomic number 31) ? [Here you
may underline or circle your answer.]
4, 0, 0, ½
4, 0, 1, ½
4, 1, 1, ½
4, 1, 2, ½
4, 2, 0, ½
In the following problems, to receive any points, you must clearly and logically show how you arrive
at your answer. All UNITS must appear at all steps of the calculation. NO WORK, NO UNITS, NO
POINTS!
16. (5 points) Light with a wavelength of 1.20 x 104 nm will break a typical metal-metal bond.
What is this metal-metal bond energy in kJ/mol? SHOW ALL WORK, INCLUDING UNITS!
Page 3
18. (10 points) A new fluorocarbon material, prepared by an undergrad at a local university, is believed to be a diprotic
acid (call it H2A for short). A 0.860 g sample of this unknown acid was titrated (reaction below) with a 0.1025 M
solution of NaOH. In the titration, 38.50 mL of the NaOH solution was required to reach the endpoint.
Determine the molecular mass of the new acid. CLEARLY SHOW ALL WORK AND UNITS......
H2A
19. (6 points)
+
2 NaOH
→
Na2A
+
2 H2O
A 10.0 L volume of an ideal gas in a cylinder with a piston is at a pressure of 4 atm. Suddenly, enough
weight is removed from the piston to lower the external pressure to 1.5 atm thus allowing the gas to expand at
constant temperature. Calculate work, w, in L.atm, for this process. CLEARLY SHOW ALL WORK AND
UNITS......
Page 4
20. (10 points) A 1.0152 g sample of an iron ore that contained Fe3O4 (231.5 g/mole) was dissolved in acid and all of
the iron was converted to Fe2+. The solution was then titrated with 0.0281 M KMnO4 according to the following
net ionic equation. To reach the endpoint, 39.42 mL of the KMnO4 solution was required. Determine the
percentage by mass of Fe3O4 in the ore. CLEARLY SHOW ALL WORK AND UNITS......
5 Fe2+
+
MnO4
+
8 H+
→
5 Fe3+
+
Mn2+
+
4 H2O
21. (10 points) A 3.34 sample of Al reacts with excess HCl to produce hydrogen gas which is collected over
water at 25.0 °C at a pressure of 740 mmHg. If the vapor pressure of water at 25 °C is 23.76 mmHg,
what total volume of gas(es), in liters, is collected? CLEARLY SHOW ALL WORK AND UNITS......
2 Al (s)
+ 6 HCl (aq)
→ 2 AlCl3 (aq) + 3 H2 (g)
Page 5
22. (7 points) Liquid ClF3 can be prepared from gaseous ClF and F2. Given the following
information, calculate the heat of reaction, ∆H°rexn, for this method of preparing ClF3 (l).
CLEARLY SHOW ALL WORK and REASONING!
2 F2 (g) + O2 (g) → 2 OF2 (g)
∆H° = -43.5 kJ
2 ClF3 (l) + 2 O2 (g) →
∆H° = 394.1 kJ
2 ClF (g) +
Cl2O (g) + 3 OF2 (g)
O2 (g) → Cl2O (g) + OF2 (g)
∆H° = 167.5 kJ
23. (10 points) When benzene, C6H6 (molar mass = 78.0 g/mol) is burned, the amount of heat released is 3273 kJ/mol.
Calculate the final temperature of a calorimeter containing 2000 g of water, when a 1.10 g sample of this
hydrocarbon is burned in the calorimeter that has an initial temperature of 22.4 °C. The heat capacity of the
calorimeter is 710 J/ °C.
CLEARLY SHOW ALL WORK AND UNITS......
Name (PRINT clearly)
Exam 2 (100 points)
October 27, 2016
Chemistry 1303.003
On my honor, I have neither given nor received unauthorized aid on this exam.
Signed
Date
Write you answer in the blank. Only what is written CLEARLY in the blank will be graded!
1
y
a. (4 points) Using the following labeled x and y axes on the right,
draw the orbital listed below the axes.
x
b. (2 points) Write the quantum number l for this orbital.
px orbital
l=
2.
3.
(4 points) The formation
reaction for acetaminophen, C8H9NO3 is
(2 points) From the following list,
are isoelectronic
Zn2+, Ar, Cl–, S, Br–, Na+, Ca2+
4.
5.
(2 points) There
are
electrons in a subshell where l = 2.
(4 points) Among the
following,
are acids and
are bases in water.
SO2, CH3OH, NH3, HBrO2, C3H8, SrO
6.
(2 points) Consider
an element with the following electron configuration.
[Xe]6s24f5 This element is
classified as
a representative element, an actinide element , a noble gas, a lanthanide element, a nonmetal, an alkali metal
7.
8.
(2 points) The
shorthand ground state electron configuration of Cr3+ is
(2 points) Among the
following types of radiation, the one with the lowest energy is
microwaves, radiowaves, UV, infrared, visible, x-rays
9. (2 points) Among the following, the one with 1 unpaired electrons is
P
Se
Cl
Mg
Ge2+
S2-
Fe3+
.
Page 2
10. (2 points) The complete ground state electron configuration for Si is
11.
(2 points)
Among the following,
P
O
has the largest first ionization energy
As
12. (2 points) Among the following,
Ca2+
13.
(2 points)
Ca
.
Mg
Al
S
has the largest atomic radius
S2-
Se2-
Cl–
K+
From the following list of wavelengths for radiation,
has the
most energy.
550 m
14.
(4 points)
3000 nm
5.2 x 10-2 nm
2.0 x 1012 nm
6.0 x 108 m
0.40 nm
A sample of He gas has a volume of 35.7 L at 20 °C at 1.5.0 atm of pressure. The volume of the gas
when heated to 150 °C is
.
15. (2 points) When a balloon is filled with a mixture of nitrogen, neon, helium, and argon, the
will leak most slowly through any small opening.
16. (2 points) Which of the following sets of quantum numbers (listed in order of n, l, ml, ms) best
describes the valence electron of highest energy in a ground-state gallium atom (atomic number 31) ?
[Here you may underline or circle your answer.]
4, 0, 0, ½
4, 0, 1, ½
4, 1, 1, ½
4, 1, 2, ½
4, 2, 0, ½
In the following problems, to receive any points, you must clearly and logically show how you arrive at
your answer. All UNITS must appear at all steps of the calculation. NO WORK, NO UNITS, NO
POINTS!
17. (6 points) A 15.0 L volume of an ideal gas in a cylinder with a piston is at a pressure of 5 atm. Suddenly,
enough weight is removed from the piston to lower the external pressure to 2.5 atm thus allowing the
gas to expand at constant temperature. Calculate work, w, in L.atm, for this process. CLEARLY
SHOW ALL WORK AND UNITS......
Page 3
18. (10 points) When benzene, C6H6 (molar mass = 78.0 g/mol) is burned, the amount of heat released is 3273 kJ/mol.
Calculate the final temperature of a calorimeter containing 2000 g of water, when a 1.50 g sample of this
hydrocarbon is burned in the calorimeter that has an initial temperature of 23.4 °C. The heat capacity of the
calorimeter is 710 J/ °C.
CLEARLY SHOW ALL WORK AND UNITS......
19. (10 points) A 1.2152 g sample of an iron ore that contained Fe3O4 (231.5 g/mole) was dissolved in acid and all of
the iron was converted to Fe2+. The solution was then titrated with 0.0281 M KMnO4 according to the
following net ionic equation. To reach the endpoint, 49.42 mL of the KMnO4 solution was required.
Determine the percentage by mass of Fe3O4 in the ore. CLEARLY SHOW ALL WORK AND UNITS......
5 Fe2+
+
-
MnO4
+
8 H+
→
5 Fe3+
+
Mn2+
+
4 H2O
Page 4
20. (10 points) A 2.34 sample of Al reacts with excess HCl to produce hydrogen gas which is collected
over water at 25.0 °C at a pressure of 740 mmHg. If the vapor pressure of water at 25 °C is 23.76
mmHg, what total volume of gas(es), in liters, is collected? CLEARLY SHOW ALL WORK AND
UNITS......
2 Al (s)
+ 6 HCl (aq)
→ 2 AlCl3 (aq) + 3 H2 (g)
21. (5 points) Light with a wavelength of 1.70 x 104 nm will break a typical metal-metal bond.
What is this metal-metal bond energy in kJ/mol? SHOW ALL WORK, INCLUDING UNITS!
Page 5
22. (10 points) A new fluorocarbon material, prepared by an undergrad at a local university, is believed to be a
diprotic acid (call it H2A for short). A 0.860 g sample of this unknown acid was titrated (reaction below) with a
0.1025 M solution of NaOH. In the titration, 38.50 mL of the NaOH solution was required to reach the endpoint.
Determine the molecular mass of the new acid. CLEARLY SHOW ALL WORK AND UNITS......
H2A
+
2 NaOH
→
Na2A
+
2 H2O
23. (7 points) Liquid ClF3 can be prepared from gaseous ClF and F2. Given the following
information, calculate the heat of reaction, ∆H°rexn, for this method of preparing ClF3 (l).
CLEARLY SHOW ALL WORK and REASONING!
2 ClF (g) +
O2 (g) → Cl2O (g) + OF2 (g)
2 ClF3 (l) + 2 O2 (g) →
Cl2O (g) + 3 OF2 (g)
2 F2 (g) + O2 (g) → 2 OF2 (g)
∆H° = 167.5 kJ
∆H° = 394.1 kJ
∆H° = -43.5 kJ