Exam 2 Practice Test FA 2023
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Course
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Subject
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Date
Dec 6, 2023
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MSE 2001: Exam 2 Practice Test
Fall 2023 - Turaski
MSE 2001: Exam 2 Practice Test
Fall 2023 - Turaski
EQUATIONS
:
𝑭
?
=
|?
?
?
?
|𝒒
?
𝟒𝝅𝜺
?
𝒙
?
(Coulomb’s Law)
?𝝀 = ?𝒅𝒔??𝜽
(Bragg’s Law)
k
b
~ 1x10
-4
eV/K
R ~ 8 J/mol-K
1 Å = 1x10
-8
cm
PERIODIC TABLE
𝒅
???
=
?
√?
?
+ ?
?
+ ?
?
F = kx
(Hooke’s Law)
F
total
=
A
x
2
-
B
x
12
E
total
= -
A
x
m
+
B
x
n
MSE 2001: Exam 2 Practice Test
Fall 2023 - Turaski
Atomic Structure
1.
Which orbital(s) most likely
contributes electrons to the “electron sea” in the metal
cobalt,
which has electron configuration 1s
2
2s
2
2p
6
3s
2
3p
6
3d
7
4s
2
?
(A)
4s
(B)
5s
(C)
4d
(D)
5d
(E)
Both the 4s and 4p
2.
Based solely on their electronic configurations, which of these metals would you expect to
have the largest saturation magnetization? (Assume no electrons are transferred between
orbitals.)
(A)
Europium (Eu)
(B)
Iron (Fe)
(C)
Manganese (Mn)
(D)
Molybdenum (Mo)
(E)
Neodynium (Nd)
3.
True/False: Positively charged ions are called cations.
(A)
True
(B)
False
4.
Which of the following elements would you expect to have the SMALLEST
electronegativity based on periodic table trends?
(A)
Br
(B)
Sr
(C)
Ba
(D)
Fe
(E)
Cl
5.
Most of the MASS of an atom is contained within:
(A)
The core shell electrons
(B)
The valence shell electrons
(C)
The nucleus
(D)
The s-orbital electrons
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MSE 2001: Exam 2 Practice Test
Fall 2023 - Turaski
Bonding
6.
Which of the following crystal class(es) would you expect to have 6-fold rotational
symmetry?
(A)
Cubic
(B)
Hexagonal
(C)
Rhombohedral
(D)
Monoclinic
(E)
Triclinic
7.
Above are energy-bond curves for 3 different metals (A, B, & C). If you wanted to design a
bimetallic strip to be used as a thermometer, which TWO of the metals would you select to
maximize the strip’s temperature sensitivity?
(A)
A and B
(B)
A and C
(C)
B and C
(D)
Both A/B and B/C will provide equally high temperature sensitivity
(E)
Both A/C and B/C will provide equally high temperature sensitivity.
8.
Which of these materials has purely covalent bonding?
(A)
Copper
(B)
Alumina (Al
2
O
3
)
(C)
Silicon
(D)
Sodium Chloride
(E)
Both A & C have purely covalent bonding
9.
True or False: The ionic portion of the Na-Cl bond in NaCl is stronger than the ionic
portion of the
Mg-O bond in MgO.
(A)
True
MSE 2001: Exam 2 Practice Test
Fall 2023 - Turaski
(B)
False
10.
Rank the following bonds in order of increasing bond strength:
Hydrogen bonds, Covalent
bonds, and (instantaneous) van der Waals bonds:
(A)
Covalent < van der Waals < Hydrogen
(B)
Hydrogen < van der Waals < Covalent
(C)
van der Waals < Hydrogen = Covalent
(D)
van der Waals = Hydrogen < Covalent
(E)
van der Waals < Hydrogen < Covalent
11.
In the force-bond curve shown above, which feature best describes the stiffness of the
material?
(A)
Length A
(B)
Length B
(C)
Length C
(D)
Slope 1
(E)
Slope 2
12.
Which of the following bonds primarily form due to electrostatic attraction?
(A)
Covalent Bonds
(B)
Ionic Bonds
(C)
Van der Waals bonds
(D)
Romantic Bonds
(E)
None of these.
MSE 2001: Exam 2 Practice Test
Fall 2023 - Turaski
13.
Which of the following DO NOT contribute to the density of a solid?
(A)
Elemental composition of the solid
(B)
Porosity
(C)
Crystal Structure
(D)
All of these contribute to the density of a solid.
(E)
None of these contribute to the density of a solid.
14.
Which of these statements about bonding, structure, and properties in materials
is NOT true.
(A)
Metallic bonding leads to high electrical conductivity because the bonding electrons are
shared amongst many atoms.
(B)
Covalent bonding is directional, which impedes close-packing and leads to materials with
more open crystal structures.
(C)
Metals with hexagonal close packing and face-centered cubic structures have the same
volume fraction packing efficiency; 74% of their space is taken up by atoms.
(D)
The Fr-F bond is generally considered 100% ionic.
(E)
Solids with significant ionic bonding are often brittle because when the material is plastically
deformed, alike charges align, leading to repulsion and fracture.
15.
If a series of metal alloys have the following enthalpies of fusion, what would you predict
their relative elastic moduli to be from smallest to largest?
Alloy A: 4 kJ/mol
Alloy B: 6 kJ/mol
Alloy C: 12 kJ/mol
(A)
(Least Stiff) A < B < C (Most Stiff)
(B)
(Least Stiff) C < B < A (Most Stiff)
(C)
(Least Stiff) B < C < A (Most Stiff)
(D)
A = B = C (All the same stiffness)
(E)
It is NOT possible to make a
reasonable prediction
from the information provided.
16.
The unit cell for rutile (TiO
2
) is shown below. Titanium atoms are smaller and blue, and
oxygen atoms are larger and red. Bonds are shown as rods between atoms. What is the
coordination number for Ti in this structure?
(A)
2
(B)
3
(C)
4
(D)
6
(E)
8
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MSE 2001: Exam 2 Practice Test
Fall 2023 - Turaski
17.
Rust, which is iron oxide (Fe
2
O
3
), has what type of bonding?
(A)
Metallic only
(B)
Ionic only
(C)
Covalent only
(D)
A mixture of ionic and metallic
(E)
A mixture of ionic and covalent
18.
Which of the following statements are true about Ca
–
O and K
–
Cl bonds?
(A)
The K-Cl bond is stronger than the Ca-O bond because it is more covalent.
(B)
The K
–
Cl bond is stronger than the Ca
–
O bond because the electrostatic attraction is greater.
(C)
The Ca-O bond is stronger than the K-Cl bond because it is more covalent.
(D)
The Ca-O bond is stronger than the K-Cl bond because the electrostatic attraction is greater.
(E)
Both bonds have similar bond strengths because their ionic fraction is similar.
19.
Which type(s) of bonds are found in a solid block of the polymer polypropylene?
(A)
Metallic Bonds
(B)
van der Waals Bonds
(C)
Covalent Bonds
(D)
Both A & B
(E)
Both B & C
Crystal Structure: General Concepts
20.
In the 2D lattice above, which of the shapes shown is a true unit cell?
MSE 2001: Exam 2 Practice Test
Fall 2023 - Turaski
(A)
A &D
(B)
B
(C)
C
(D)
D
(E)
None of these are true unit cells
21.
Which of these crystal classes has at least two inter-axial angles equal to 90°?
(A)
Rhombohedral, Tetragonal, and Monoclinic
(B)
Rhombohedral, Hexagonal, and Monoclinic
(C)
Triclinic, Tetragonal, and Monoclinic
(D)
Tetragonal, Hexagonal, and Monoclinic
(E)
None of these sets of crystal classes fit the above description.
22.
True or False: All crystalline materials have 1-fold rotational symmetry.
(A)
True
(B)
False
23.
In the 2D lattice above, which of the shapes is a true unit cell?
(A)
A
(B)
B
(C)
C
(D)
D
(E)
None of these are true unit cells
MSE 2001: Exam 2 Practice Test
Fall 2023 - Turaski
24.
Which of the following rotational symmetries is forbidden in crystal lattices?
(A)
1-fold rotational symmetry
(B)
2-fold rotational symmetry
(C)
4-fold rotational symmetry
(D)
5-fold rotational symmetry
(E)
Both A and D
25.
What type(s) of rotational symmetry does this object have? (ignore shading)
(A)
1-fold symmetry
(B)
2-fold symmetry
(C)
4-fold symmetry
(D)
Both A & C
(E)
A, B, & C
Crystal Structure: Lattice, Basis and Miller Indices
26.
What is the Miller Index notation for the point
shown to
the right?
(A)
1,1,1/3
(B)
1,0,1/3
(C)
3,0,1
(D)
1, 0, 1
(E)
None of these
27.
What is the Miller Index notation for the point
shown to the
right?
(A)
1,1,1/3
(B)
1,0,1/3
(C)
3,0,1
(D)
1, 0, 1
(E)
None of these
28.
Shown here is the unit cell for the metal polonium. How would you best describe its lattice
& basis?
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MSE 2001: Exam 2 Practice Test
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(A)
Base-centered lattice with 1 atom basis.
(B)
Body-centered lattice with 1 atom basis
(C)
Body-centered lattice with 2 atom basis
(D)
Primitive lattice with 1 atom basis
(E)
Primitive lattice with 2 atom basis
29.
True or False: The (121), (242), and (484) planes are all parallel with one another in a
cubic crystal.
(A)
True
(B)
False
30.
Describe the lattice and basis for the cadmium telluride (CdTe) crystal structure. CdTe is a
material used in inorganic solar cells. The unit cell for CdTe is shown to the right.
z
(A)
Primitive lattice with a 1 Cd + 1 Te atom basis
(B)
Primitive lattice with a 1 Cd + 8 Te atom basis
(C)
Face-centered with a 1 Cd + 1 Te atom basis
(D)
Face-centered with a 1 Cd+ 8 Te atom basis
(E)
Body-centered lattice with a 1 Cd + 2 Cd atom basis
31.
Which of these planes is the (10
?
̅
)?
E. None of these
32.
Which of these vectors represent the [110] direction?
MSE 2001: Exam 2 Practice Test
Fall 2023 - Turaski
E. All of these
33.
Which plane is shown in the cubic unit cell to the right?
(A)
(120)
(B)
(210)
(C)
(2
1
̅
0)
(D)
(1
2
̅
0)
(E)
(1
2
̅
0)
34.
Which direction is shown in the tetragonal unit cell
shown to
the right?
(A)
[110]
(B)
[1
1
̅
0]
(C)
[
1
̅
1
̅
0]
(D)
[1
1
̅
0]
(E)
[101]
35.
Which of these images shows the (200) plane in a unit cell?
E. None of these
36.
Which direction is shown in the cubic unit cell shown to the right?
MSE 2001: Exam 2 Practice Test
Fall 2023 - Turaski
(F)
[½1½]
(G)
[121]
(H)
[½½1]
(I)
[1
12
]
(J)
[221]
Crystal Structure: Specific Structures and Applications
37.
Shown here is the unit cell for cuprite (Cu
2
O), a naturally occurring ore of copper. What can
you conclude about this crystal’s lattice and basis?
(Ca = black atoms, F = white atoms).
(A)
This is a primitive cubic lattice with a basis of 1
copper
atom and 2 oxygen atoms.
(B)
This is a body-centered cubic lattice with a basis of 1
copper
atom and 2 oxygen atoms.
(C)
This is a body-centered cubic lattice with a basis of 4
copper
atoms and 9 oxygen atoms.
(D)
This is a face-centered cubic lattice with a basis of 1
copper
atom and 2 oxygen atoms.
(E)
This is a face-centered cubic lattice with a 4 copper
atoms
and 9 oxygen atoms.
38.
A cubic unit cell has lattice parameter a = 2.5 Å. What is the volume of this unit cell?
(A)
1.56 x10
-29
cm
3
(2.5 × 10
−10
)
3
(B)
1.56 x10
-23
cm
3
(
2. 5
3
×
(10
−10
)
3
(10
−2
)
3
)
(C)
1.56 x10
-18
cm
3
(
2. 5
3
×
(10
−8
)
3
(10
−2
)
3
)
(D)
1.56 x10
-7
cm
3
(
2. 5
3
×
10
−10
10
−2
)
(E)
The inter-axis angles are needed to make this calculation.
39.
Assuming a cubic lattice, which of these planes will diffract at the LARGEST 2
angle when the
material’s
structure is characterized with x-ray diffraction?
(A)
(111)
(B)
(002)
(C)
(120)
(D)
(220)
(E)
(211)
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MSE 2001: Exam 2 Practice Test
Fall 2023 - Turaski
40.
To which crystal system does the unit cell shown at right belong? (Assume lengths are
roughly to scale.)
(A)
Triclinic
(B)
Cubic
(C)
Orthorhombic
(D)
Hexagonal
(E)
Rhombohedral (trigonal)
41.
Compare the density of wood to the density of the polymer Plexiglas. Explain.
(A)
Their densities are about the same because they have similar compositions.
(B)
Wood is less dense than Plexiglas because it has a more open crystal structure.
(C)
Wood is less dense than Plexiglas because it has more porosity.
(D)
Wood is less dense than Plexiglas because the wood is composed of elements with lower
atomic number than Plexiglas.
(E)
Wood is more dense than Plexiglas because the wood is composed of elements with higher
atomic number than Plexiglas.
42.
The unit cell of a new crystal has been determined. The angles between each of its three lattice
directions are all 90°, but the lattice parameter for one direction is different from the other
two (a = b
≠
c).
Which lattice type is this crystal?
(A)
Cubic
(B)
Tetragonal
(C)
Orthorhombic
(D)
Rhombohedral
(E)
Monoclinic
43.
In a triclinic crystal, all lattice parameter lengths (a, b, c) and all inter-axial angles
(
) must be different from one another.
(A)
True
(B)
False
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The volume of stock solution of aspirin= 100ml
The dilution factor for the stock solution= 50/2
Molar mass of SAS = 180.157 g/mole
c) Measurements of Absorbance:
Solution
Absorbance
SA1
0.154
SA2
0.524
SA3
0.789
SA4
0.989
The unknown sample
0.259
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1-2) The Atomic Hotel
The Atomic Hotel is a special hotel designed for electrons. The hotel has a strict policy called
the Aufbau principle that states "ground" floors must be filled first and in order. It costs more
to get rooms on higher floors. In the atomic world energy is money so "excited" electrons get
I.
rooms on higher floors, thus the exception to hotel policy.
Looking back through the old guest logs the following layouts can be sketched. Determine
which electrons had more "money". Label those electrons as excited.
|1
1|| 1
|1L||1L||1L
May 23, 1998
June 19, 1999
September 10, 1991
C
A
B
II.
Another policy that the hotel enforces is called the Pauli Exclusion Principle. It was
determined in 1925 that electrons can occupy the same room, but only if they have opposite
spins so they do not interfere with one another.
Which electrons below did not follow the Pauli exclusion principle?
1 1 1 1 1
1
11 1 1
|1.
1L 1 1
1 1 11
1 1 1
1 1 1|
1L
1L
1L
April 2, 1995
December 1, 2000
July 4,…
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Scenario: pouring liquid nitrogen (-196°C or – 320 °F) on a balloon .
Link: https://www.youtube.com/watch?v=al5f9q845q0
List the variables (P, V, T, n) as either increasing, decreasing, or staying constant in this
experiment. (2 of them will be constant)
increasing
decreasing
staying constant
Before Particle Picture
After Particle Picture
Time in video: 11 seconds
Time in video: 30 seconds
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