UWLA Chemistry Worksheet

Name: _____________________________________Date: ______________
VERSION:
B
Chem 11 Spring 2022 Final Exam part 1
1. 7.73 grams of Sr metal reacts with an excess of acid at 1C and 0.95atm:
Sr(s) + 2HI(aq)  SrI2(aq) + H2(g)
Was work done by the reaction or on the reaction? How much?
A) 173 Latm of work is done on the reaction
B) 9.184 Latm of work is done on the reaction
C) 0.00392 Latm of work is done by the reaction
D) No work is being done by or on the reaction
E) 1.99 Latm of work is done by the reaction
2. On the fictional planet of Nofactori, two commonly used mass units are related to one another by the
following exact conversion:
1 grod = 23 blogs
How would scientists on Earth, using SI prefixes, express 179 megagrods in terms of milliblogs?
0
A) 4.12  10
12
B) 7.78  10
20
C) 9.47  10
3
D) 7.78  10
12
E) 4.12  10
3. Combustion (burning with O2) of 48.48 g of a compound composed of carbon, hydrogen, and oxygen
leads to the formation of 56.86 g of CO2 and 17.46 g of H2O. The properties of the compound suggest
that the molar mass should be 75.04 g/mol. How many hydrogen atoms are there in one molecule of the
compound?
A) 9
B) 6
C) 2
D) 8
E) 3
4. A vessel with a volume of 17.1 L contains 2.80 g of nitrogen gas, 0.807 g of hydrogen gas, and 79.9 g
of argon gas. At 25°C, what is the pressure in the vessel?
A) 61.1 atm
B) 3.57 atm
C) 4.29 atm
D) 0.300 atm
E) 119 atm
1
5.
234 3 
X has:
92
A)
B)
C)
D)
E)
92 protons, 142 neutrons, and 95 electrons
234 protons, 92 neutrons, and 89 electrons
92 protons, 234 neutrons, and 92 electrons
234 protons, 142 neutrons, and 89 electrons
142 protons, 92 neutrons, and 3 electrons
6. The names and symbols for metals in the fictional republic of Questia are different from those used by
the rest of the planet. The rest of the chemical nomenclature is the same as in English speaking
countries. The metal “Qagiqium” (symbol Qa) is known to make many compounds including QaSO4,
QaPO4, and QaNO3. What would be the name of QaCl2 in the republic of Questia?
A) Qagiqium chloride
B) Qagiqium dichloride
C) Qagiqium (III) chloride
D) Qagiqium chlorite
E) Qagiqium (II) chloride
7. You mix 78.9 mL of 0.758 M silver nitrate with 34.8 mL of 0.776 M rubidium chloride. How many
grams of precipitate would be formed?
A) 8.57 g
B) 3.87 g
C) 0.0270 g
D) 0.0598 g
E) no precipitate would be formed
8. 0.751 g sample of lithium, upon reacting with oxygen, produced 1.617 g of product. What was the mass
of oxygen consumed in this reaction?
A) 0.866 g
B) 3.463 g
C) 1.371 g
D) 1.201 g
E) 1.731 g
2
9. When 2.293 g of a liquid is turned into gas at 148.51°C and 0.578 atm, the gas occupies a volume of
2.362 L. The empirical formula of the compound is C2H5. What is its molecular formula?
A) C6H15
B) C8H20
C) C10H25
D) C2H5
E) C4H10
10. Which species is oxidized in the following reaction?
2XO 2 + 2OH  + 3Na 2 ZO 4 
 2XO 4 + 3Na 2 ZO 3 + H 2 O
A)
B)
C)
D)
E)
Na 2 ZO 4
H2O
XO 2
OH 
Na 2 ZO 3
11. In a 9.56-liter container that initially has zero pressure, we heat 12.39 grams of lead(II) nitrate,
Pb(NO 3 ) 2 , which decomposes according to the equation:
2Pb(NO 3 ) 2 (s)  2PbO(s)  4NO 2 (g)  O 2 (g)
Assuming complete decomposition, what is the pressure in the cylinder after the reaction is complete
and the system is cooled to a temperature of 279 K? Remember that the molar volumes of solids and
liquids are negligible compared with those for gases under ordinary conditions that apply here.
A) 0.0896 atm
B) 0.224 atm
C) 0.448 atm
D) 0.0448 atm
E) 0.358 atm
3
12. Nitric oxide, NO, is made from the oxidation of NH3, and the reaction is represented by the equation:
4NH3 + 5O2  4NO + 6H2O
A sample of NH3 produced 14.9 g of NO. If the percent yield of NO is 89.2 %, how much ammonia
was used?
A) 18.7 g
B) 14.9 g
C) 16.7 g
D) 13.3 g
E) 9.48 g
13. Which of the following data sets are reported with appropriate precision?
Measurements
I) 18.82, 18.99, 18.55
II) 33.35, 33.47, 33.10
III) 4.378, 4.391, 4.361
A) I not appropriate
II not appropriate
III not appropriate
B) I appropriate
II appropriate
III not appropriate
C) I not appropriate
II appropriate
III not appropriate
D) I not appropriate
II appropriate
III appropriate
E) I not appropriate
II not appropriate
III appropriate
4
14. Express the H for the net reaction
4A + 4B + C  3D + 2E + 4F
given the following thermochemical equations:
A)
B)
C)
D)
E)
4A  C + 2D

2B + C  D + E

D  4F






15. What is the enthalpy change when 38.4 mL of 0.48 M sulfuric acid reacts with 18.4 mL of 0.284 M
potassium hydroxide, if we know that 111.6 kJ of heat is released per mol of salt produced?
A) –2.06 kJ
B) 2.06 kJ
C) –0.292 kJ
D) –112 kJ
E) 0.292 kJ
16. I2 and OCl2 gases are released at the same spot at the same time. How many seconds does OCl2 take to
diffuse to the same distance that I2 diffused to in 7.10 seconds? (Reminder: the question is asking about
time, not rate)
A) 7.10 s
B) 20.7 s
C) 12.1 s
D) 4.15 s
E) 60.6 s
5
17. How many boron atoms are there in 37.2 grams of Rh2(B4O7)3?
A)
B)
C)
D)
E)
4.00  10 23
23
1.33  10
24
7.23  10
1
6.65  10
23
2.34  10
18. As part of a data analysis, you have to subtract 9941.0 from each data point and report the average of
those subtractions. How many significant figures should you report it with, given the following data
points?
9942.5, 9945.2, 9944.3, 9946.9
A)
B)
C)
D)
E)
5
3
4
2
infinite
19. If 3.187  10
22
g of HIO4 contains 1.063  10
22
g of oxygen, how much oxygen is contained in
2
4.164  10 g of HIO4 according to the Law of Definite Proportions?
A)
B)
C)
D)
E)
1
3.472  10 g
2
1.389  10 g
0
2.187  10 g
2.776  10 2 g
2
5.555  10 g
20. Grohine (symbol Gh) is a fictional name for one of the halogens, and ends with “ine” just like the actual
halogens we know and love . According to the nomenclature rules we have learned in this class, what
would be the name of HGhO ?
A) hypogrohous acid
B) grohous acid
C) grohic acid
D) hydrogen hypogrohite
E) hydrogen monogrohine monoxide
6
21. We only know the ratios in which the reactants go into the following reaction:
7 MgBr2 + 5 Li3BO3 + 4 H2SO4  unknown products
5
4
4
If 1.160  10 g of MgBr2 , 2.747  10 g of Li3BO3 , and 1.922  10 g of H2SO4 were put into the
reaction container, which of the following correctly shows the remaining reactant amounts at the end of
the reaction?
4
3
0
4
3
0
2
2
0
4
3
3
4
4
4
A) 8.235  10 g MgBr2, 3.442  10 g Li3BO3 , 0.000  10 g H2SO4
B) 5.284  10 g MgBr2, 7.963  10 g Li3BO3 , 0.000  10 g H2SO4
C) 2.870  10 g MgBr2, 1.000  10 g Li3BO3 , 0.000  10 g H2SO4
D) 4.971  10 g MgBr2, 5.494  10 g Li3BO3 , 7.963  10 g H2SO4
E) 6.315  10 g MgBr2, 1.951  10 g Li3BO3 , 2.707  10 g H2SO4
22. The temperature of a sample was observed to increase by 3.9 Kelvin. What is the value of this change
in °F?
A) –289
B) 7.0
C) 257
D) –15.6
E) 2.17
23. On the fictional planet Rylos, a somewhat fictional element with an atomic mass of 151.727 a.m.u. has
two naturally occuring isotopes, with atomic masses of 150.927 and 152.912. What is the percent
abundance of the isotope whose atomic mass is 150.927?
A) 94.1 %
B) 71.8 %
C) 5.9 %
D) 40.3 %
E) 59.7 %
7
24. The enthalpy of combustion of heptane is –48.06 kJ/g. Combustion of 3.81 g of heptane causes a
temperature rise of 3.06°C in a certain bomb calorimeter. What is the heat capacity of this bomb
calorimeter?
A) 9.97 kJ/°C
B) 59.8 kJ/°C
C) 0.243 kJ/°C
D) 183 kJ/°C
E) 560 kJ/°C
25. On the fictional planet of Unifactoria, two commonly used length units are related to one another by the
following exact conversion:
1 gral = 31 bluks
How would scientists on Earth, using SI prefixes, express 257 cubic grals of volume in terms of cubic
picobluks?
15
A) 7.97  10
42
B) 7.66  10
19
C) 2.47  10
30
D) 7.66  10
29
E) 2.47  10
8
VERSION:
B
Chem 11 Spring 2022 Final Exam part 2
26. Which answer choice correctly lists the molecular geometry of the molecules (or ions) of the following
species (if they existed), in the order they are given?
XF6, XL2, LX3, QF3
Q is a Group 3A element in Period 2 or 3
L is a Group 5A element
J is a Group 6A element with Z>10
X is a Group 7A element with Z>10
F is fluorine
H is hydrogen
C is carbon
O is oxygen
A)
B)
C)
D)
E)
octahedral, linear, trigonal pyramidal, trigonal planar
octahedral, linear, tetrahedral, trigonal planar
trigonal bipyramidal, trigonal planar, bent, linear
trigonal bipyramidal, trigonal planar, trigonal planar, linear
octahedral, trigonal planar, bent, trigonal planar
1
27. When two electrons were added to a particular diatomic species, its bond order decreased by 1 and its
magnetism changed (either from paramagnetic to diamagnetic or from diamagnetic to paramagnetic; we
do not know). Which of the following could be the molecular orbital energy diagram of the diatomic
species before the electrons were added?
C)  *2p 
E)  *2p 
A)  *2p 
 *2p 
 2p

 *2p 
 *2p 
 2p 
 2p 
 2p 
 2p

 2p


 *2s



 *2s



 *2s


 2s

 2s

 2s

B)  *2p

D)  *2p


*
2p



 2p

*
2p
 2p 
 2p 
 2p


 *2s



 *2s


 2s

 2s

2
28. Given the information below, calculate the lattice energy of the metal oxide compound M 2O3, where M
is a metal.
Hf of M2O3(s) = –1081 kJ/mol
First ionization energy of M = 844 kJ/mol
Second ionization energy of M = 1722 kJ/mol
Third ionization energy of M = 3289 kJ/mol
O2(g)  2 O(g)
H = 498 kJ


O(g) + e  O (g)
H = –142 kJ


2
H = 844 kJ
O (g) + e  O (g)
M(s)  M(g)
H = 90 kJ
(Hint: Pay attention to the stoichiometry when applying Hess’s Law for the Born-Haber cycle)
A)
B)
C)
D)
E)
–18390 kJ/mol
–15824 kJ/mol
–21950 kJ/mol
–7984 kJ/mol
–28606 kJ/mol
29. Considering gas samples at the same molar density, which of the following compounds deviates the
least from ideal gas behavior at room temperature?
2.
1.
4.
A)
B)
C)
D)
E)
3.
5.
2
1
3
4
5
3
30. Consider the following portion of the energy-level diagram for Li2+ :
n=8
n=7
n=6
n=5
n=4
n=3
n=2
19
3.063  10 J
19
4.000  10 J
19
5.445  10 J
19
7.841  10 J
18
1.225  10 J
18
2.178  10 J
18
4.901  10 J
Which of the following statements is true?
A) Light with a wavelength of 93.08 nm can excite an electron from n = 3 to n = 7 if
sufficiently intense light is used.
B) Light with a wavelength of 93.08 nm cannot excite an electron from n = 3 to n = 7
because its photons do not have enough energy.
C) Light with a wavelength of 93.08 nm cannot excite an electron from n = 3 to n = 7
because its photons have the wrong amount of energy.
D) Light with a wavelength of 93.08 nm can excite an electron from n = 3 to n = 7.
E) Light with a wavelength of 93.08 nm cannot excite an electron from n = 3 to n = 7
because electrons must climb the energy levels one step at a time.
31. Describe the hybrid orbitals used by each carbon, oxygen, and nitrogen atom in

O
||



NH  C  C  OH

|
CH3

Atom #:
A)
B)
C)
D)
E)
1
2
3
sp3
sp3
sp2
sp3
sp2
sp2
sp3
sp2
sp2
sp2
sp3
sp3
sp3
sp2
sp2
4
5
6
sp
sp2
sp2
sp3
sp2
sp3
sp3
sp3
sp3
sp
sp
sp3
sp2
sp3
sp2
4
32. Given the following information, which compound has “nonpolar” molecules (i.e. the molecular dipole
moment is precisely zero)?
L is a Group 5A element with Z>10
J is a Group 6A element with Z>10
X is a Group 7A element with Z>10
Q is a noble gas with Z>36
F is fluorine
H is hydrogen
O is oxygen
A) XF5
B) LH3
C) QOF2
D) JO2
E) QF2
33. How many electrons are left in the original valence shell (the valence shell it had as a neutral atom) of a
copper atom when it forms a Cu + ion?
A) 2
B) 10
C) 0
D) 5
E) 1
34. Which of the following lists the predicted lattice energy magnitudes in increasing (from small to large)
order?
A) K3N , Rb3P , Na3P
B) Cs3As , Li3P , Li3N
C) Li3N , Li3P , Cs3As
D) Na3P , Li3N , Li3P
E) Li3P , Li3N , Na3P
35. CBr4 has a higher boiling point than CF 4. This is because
A) dispersion forces are larger in CBr4
B) CF4 has hydrogen bonding interactions
C) dipole-dipole forces are larger in CBr 4
D) dispersion forces are larger in CF4
E) dipole-dipole forces are larger in CF4
5