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MATSE 201 Exam 1 with complete solutions 2024_2025
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MATSE 201 Exam 1 with complete solutions 2024_2025
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MATSE 201 Exam 1 with completesolutions 2024/2025
Metals - ANSWER✓✓-metallic bonding where electrons are
delocalized
- dense, stiff, strong, ductile
- high thermal & electrical conductivity
- opaque, reflective
Polymers/plastics - ANSWER✓✓-covalent bonding where electrons
are shared
- soft, ductile, low strength, low density
- thermal & electrical insulators
- optically translucent or transparent
Ceramics - ANSWER✓✓-ionic bonding where electrons are donated
and received
- oxides, nitrides, carbides
- hard, brittle, refractory, glassy, elastic only
- non-conducting (insulators)
- withstand high temperatures (T>Tm for metals)
Attractive Energy - ANSWER✓✓-high Ea --> high MP;
use equation (1/4π*epsilon0*r)(Z₁e)(Z₂e) to determine attractive energy - the
higher Z₁*Z₂ is, the higher the melting point - the higher r is, the lower the melting
point
% Ionic Character - ANSWER✓✓-use %IC equation to determine how
much of ionic bonding there is - what remains is likely covalent (all
compounds have IMFs); Xa & Xb are electroneg values
, Single crystalline - ANSWER✓✓-long-range order, periodic
arrangement, even spacing - all ordered crystal structures can be
reduces to a single unit cell
polycrystalline - ANSWER✓✓-some spots of order, some in random
spaces
amorphous - ANSWER✓✓-complete disorder at long scales
short range order - ANSWER✓✓-all materials have bonding at small
range order length scales (crystalline materials also have long-
range order)
Types of 2D Lattices - ANSWER✓✓-square lattice, rectangular lattice,
area centered rectangular lattice, parallelogram lattice, hexagonal
lattice
primitive lattice - ANSWER✓✓-only one lattice point per unit cell (ex:
square, parallelogram, rectangular)
7 Crystal Systems - ANSWER✓✓-cubic, hexagonal, tetragonal,
rhombohedral (trigonal), orthorhombic, monoclinic, triclinic
cubic system - ANSWER✓✓-axial relationship: a=b=c;
interaxial angles: α=β=γ=90°
hexagonal system - ANSWER✓✓-axial relationship: a=b≠c;
interaxial angles: α=β=90°, γ=120°
tetragonal system - ANSWER✓✓-axial relationship: a=b≠c;
interaxial angles: α=β=γ=90°
rhombohedral system (trigonal) - ANSWER✓✓-axial relationship:
a=b=c;
interaxial angles: α=β=γ≠90°
orthorhombic system - ANSWER✓✓-axial relationship: a≠b≠c;
interaxial angles: α=β=γ=90°
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