Name: __________________________ Date: _____________
1. A system releases 255 J of heat to the surroundings while performing 428 J of work.
What is the change in internal energy of the system in joule (J)?
A)
B)
C)
D)
E)
-683
-173
+683
+173
+87.5
2. 30.5 g sample of an alloy at 93.0 C is placed into 50.0 g of water at 22.0 C in an
insulated coffee cup at the same temperature and having a heat capacity of 9.2 J/C. If
the final temperature of the system is 31.1 C, what is the specific heat of the alloy?
A)
B)
C)
D)
E)
1.1 J g-1 C-1
1.9 J g-1 C-1
2.6 J g-1 C-1
0.65 J g-1 C-1
1.3 J g-1 C-1
3. Calculate Hrxn for the reaction: 2NOCl(g)

N2(g)
+
O2(g)
+ Cl2(g)
Given the following set of reactions:
½ N2(g) +
½ O2(g)
NO(g)
½ Cl2(g)
A)
B)
C)
D)
E)
+


NO(g)
NOCl(g)
H = 90.3 kJ
H = -38.6 kJ
-103.4 kJ
-51.7 kJ
51.7 kJ
128.9 kJ
257.8 kJ
4. Enthalpy is defined as:
A)
B)
C)
D)
E)
the sum of the internal energy and the pressure-volume product of a system
the heat of combustion
the energy contained within a system
the sum of the kinetic and potential energies
the work not limited to pressure volume work
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5. A quantity of 85.0 mL of 0.600 M HNO3 is mixed with 85.0 mL of 0.600 M KOH in a
constant-pressure calorimeter. The initial temperature of both solutions is the same at
17.35 C, and the final temperature of the mixture is 19.02 C. What is the heat
capacity of the calorimeter?
Assume that the specific heat as well as the density of the solutions are the same as
those of water (4.18 J g-1 C-1 and 1.00 g/mL respectively)
Molar heat of neutralization is -56.20 kJ/mol.
A)
B)
C)
D)
E)
1.01 x 103 J/C
2.87 J/C
2.87 103 J/C
4.23 x 103 J/C
2.26 x 103 J/C
6. Rank the following photons in order of decreasing energy:
a) Infra Red ( = 6.5 x 1013 s-1);
x 1015 s-1).
A)
B)
C)
D)
E)
b) microwave ( = 9.8 x 1011 s-1);
c>a>b
b>c>a
c> b>a
a>c>b
a>b>c
7. The energy of an orbital in the hydrogen atom depends on -------------A)
B)
C)
D)
E)
n only
n, l and ml
n and l
l only
ml only.
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c) UV ( = 8.0
8. Calculate the wavelength (in Å) of the photon absorbed when a hydrogen atom
undergoes a transition from n = 1 to n = 3. ( 1 Å = 10-8 cm)
(The Bohr equation constant is 2.18 x10-18 J)
A)
B)
C)
D)
E)
1.03 x 103
513
434
1.27 x 103
1.98 x 103
9. Which series of subshells is arranged in order of increasing energy in a
multiple-electron atom (lowest energy first)?
A)
B)
C)
D)
E)
6s, 4f, 5d, 6p
5d, 4f, 6s, 6p
4f, 6s, 5d, 6p
4f, 5d, 6s, 6p
6s, 6p, 5d, 4f
10. What is the minimum uncertainty in the position of a proton moving at a speed
of 5 x 105 m/s ± 5 percent? (The mass of a proton is 1.67 x 10-27 kg)
A)
B)
C)
D)
E)
1 x 10-12 m
2 x 10-12 m
3 x 10-12 m
4 x 10-12 m
5 x 10-12 m
11. Which element in the following set of atoms would you expect to have the lowest IE3 ?
I) Li
A)
B)
C)
D)
E)
II) Al
III) B
II
I
III
IV
V
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IV) Be
V) Mg
12. An ion (M2+) derived from a metal in the first transition metal series has four electrons
in the 3d subshell. What element might M be?
A)
B)
C)
D)
E)
Cr
Ti
Fe
Mo
Co
13. Which one of the following is the correct electron configuration of Ga3+ ?
A)
B)
C)
D)
E)
[Ar] 3d10
[Ar] 3d7 4s2 4p1
[Ar] 3d8 4s2
[Ar] 3d9 4s1 4p1
[Ar] 3d9 4p1
14. The electron affinity of oxygen is equal to
A)
B)
C)
D)
E)
the ionization energy of O–.
thrice the electron affinity of O+.
the second ionization energy of O.
the ionization energy of O2–.
the ionization energy of O2+.
15. Which one of these elements has the greatest metallic character?
A)
B)
C)
D)
E)
Ni
Br
Se
As
Si
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16. Use the following data to calculate the lattice energy (Hlattice) of MgF2.
Mg(s)
F2(g)
Mg(g)
 Mg(g)
 2F(g)
e-
Mg(s) +
A)
B)
C)
D)
E)
F2(g)
= 159.0 kJ
e-
H
= 738.0 kJ
e-
H
= 1450. kJ
+
 Mg2+(g) +
+
= 148.0 kJ
H
 Mg+(g)
Mg+(g)
F(g)
H
 F -(g)
H
 MgF2(s)
Hf
= -328.0 kJ
= -1123 kJ
2962 kJ
1050. kJ
1476 kJ
2306 kJ
2100. kJ
17. Use Lewis structures and bond energies to calculate the enthalpy change of the
following reaction:
HCN(g) + 2H2(g)  CH3NH2(g)
Given Bond energies in kJ/mol for: C-H = 413, C-N = 305, C=N = 615, CN = 891,
N-H = 391, and H-H = 432 respectively.
A)
B)
C)
D)
E)
-158 kJ
-234 kJ
171 kJ
103 kJ
-212 kJ
18. Arrange the following substances with polar covalent bonds in order of increasing bond
polarity:
a) SCl2
A)
B)
C)
D)
E)
b) PF3
a<c<b
b<c<a
c<a<b
b<a<c
a<b<c
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c) SF2
19. After drawing the Lewis structure of formic acid (HCOOH), pick the INCORRECT
statement from the following.
A) The carbon has a lone pair.
B) One oxygen is not only bonded to hydrogen but also forms a double bond to
carbon.
C) Both oxygens have two lone pairs.
D) The O-H bond is a single bond.
E) The C-H bond is a single bond.
20. Choose the groups of molecules below in which all the molecules have a net dipole
moment.
A)
B)
C)
D)
E)
HF, CH3Cl, H2O
SiHCl3, O2, H2O
HF, H2C=CH2, H2O
HCl, NH3, CCl4
HF, H2O, N2
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Answer Key
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
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