MAT E 273|49 Exam 1 (ISU) Questions And Answers|2024
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Course
MAT E 273
Institution
MAT E 273
_________ bonding is responsible for binding separate sheets of graphene together to form graphite. - ️️Van der Waals
_________ bonding is responsible for binding separate water molecules together to form a crystal of ice. - ️️Hydrogen
2-fold symmetry - ️️diamond (diad)
3 fold symmet...
_________ bonding is responsible for binding separate sheets of graphene together to form graphite. -
✔ ✔ Van der Waals
_________ bonding is responsible for binding separate water molecules together to form a crystal of ice.
- ✔ ✔ Hydrogen
2-fold symmetry - ✔ ✔ diamond (diad)
3 fold symmetry - ✔ ✔ triangle (triad)
4-fold symmetry - ✔ ✔ square (tetrad)
6 fold symmetry - ✔ ✔ hexagon (hexad)
a reduced-sphere depiction of the diamond cubic unit cell. The lattice parameter of diamond is 3.567 Å.
Compute the total area of a single {110} plane that intersects with (and is contained within) this unit cell.
- ✔ ✔ 17.99 Å2
A reduced-sphere depiction of the diamond cubic unit cell. The lattice parameter of diamond is 3.567 Å.
In terms of fractional lattice vectors, if atom A is positioned at the origin then atom B is displaced by 1/4,
1/4, -1/4 and atom C is displaced by 1, 1, -1. Compute the distance between the centers of the carbon
atoms B and C. - ✔ ✔ 4.63 Å
e.g. methane, propane, polylethylene - ✔ ✔ covalent bonding within a molecule (C-C, C-H), &
London between molecules
APF BCC - ✔ ✔ .68
APF FCC - ✔ ✔ .74
APF SC - ✔ ✔ .52
, C - Graphite, C60, C-nanotube - ✔ ✔ sp2 covalent with london between
C-diamond, Ge, Si - ✔ ✔ sp3 covalent
Closed-Packed Direction (BCC) - ✔ ✔ <111> BODY DIAGONALS
Closed-Packed Direction (FCC) - ✔ ✔ <110> FACE DIAGONALS
Closed-Packed Direction (SC) - ✔ ✔ <100> EDGES
Compute the theoretical density of Molybdenum (Mo) metal (under STP conditions), given that its
atomic radius is 0.1363 nm and its atomic weight is 95.94 g/mol. - ✔ ✔ 10.22 g/cm3
Debye Forces - ✔ ✔ dipole-induced dipole
Eutectic - ✔ ✔ liquid transforms to two solid phases
How many total iron (Fe) atoms reside with a unit cell of iron that is at 0oC and 1 atmosphere of
pressure ? - ✔ ✔ 2
How to compute theoretical density? - ✔ ✔ 1. Find mass/unit cell((#atoms/unit cell)/(Avogadro's
#))*(Atomic weight)
2. Vc = a^3
eg. (2Rsqrt2)^3
n = #atoms
A = atomic weight
Na = avogadros #
2. Compute density
How to find concentration of impurities? - ✔ ✔ 1. Find avg impurities/celln=(%impurities)*(#atoms
in cell)
2. Find volume of unit cell
3. n/V
How to find concentration of vacancies - ✔ ✔ 1. Find atomic density; Nv
2. Use the self diffusivity eqn. (aka Arrhenius Behavior) (w/ activation energy)
No = NaP/A
Nv=Np(exp^[-Ea/kT])
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