Midterm 1

Question 1

Properties of Materials (6)

Answer 1

Mechanical, Thermal, Optical, Magnetic, Environmental, Electrical

Question 2

Mechanical Properties Need to Know (6)

Answer 2

Yield Strength, Youngs Modulus, Ultimate Tensile Strength, Fracture Strength, Ductile, Toughness

Question 3

Triangles and Direction

Answer 3

Properties, Structure, Processing, Performance

Question 4

Which In the Triangle Is Science

Answer 4

Structure and Properties

Question 5

Which in the Triangle is Engineering

Answer 5

Processing and Performance

Question 6

Primary Materials

Answer 6

Metal, Ceramic, Polymer

Question 7

What Bond is Metal

Answer 7

Metallic

Question 8

What Bond is Ceramic

Answer 8

Ionic

Question 9

What Bond is Polymer

Answer 9

Covalent

Question 10

Properties of Metal

Answer 10

Dense, Strong, Reflective, Opaque, High Thermal and Electrical Conductive, Medium Melting Point, Can Corrode

Question 11

Properties of Ceramic

Answer 11

High Melting Point, Resistor, Brittle, Corrode Resistant, Glassy, Inelastic, Medium Density

Question 12

Polymer Properties

Answer 12

Corrode Resistant, Low Density, Soft, Ductile, Thermal and Electrical Conductive, Translucent or Transparent

Question 13

Which is stronger Faster Cooling Or Slower

Answer 13

Faster Cooling is Stronger

Question 14

Atomic Structure

Answer 14

Proton Electron Neutron

Question 15

Charge of Proton

Answer 15

Positive

Question 16

Charge of Electron

Answer 16

Negative

Question 17

Charge of Neutron

Answer 17

Neutral

Question 18

Isotopes

Answer 18

Element with 2 or more different atomic masses

Question 19

Quantum Number N

Answer 19

Principle (energy shell level)

Question 20

Quantum Number L

Answer 20

Subsidiary (Orbitals)

Question 21

Quantum Number m_L

Answer 21

Magnetic

Question 22

Quantum Number m_s

Answer 22

Spin

Question 23

Value of L

Answer 23

N-1

Question 24

Value of m_l

Answer 24

(+-)L

Question 25

Max electrons in subshell

Answer 25

s=2 p=6 d=10 f=14

Question 26

Higher level electron rule

Answer 26

After 3p 4s 3d

Question 27

Which section of the periodic table gives and which takes

Answer 27

Bottom left gives more upper right takes

Question 28

Which bonding is directional

Answer 28

Covalent

Question 29

Why are metals strong even if the bond is weak

Answer 29

They are densely packed because they are non directional and ordered packing

Question 30

SC unit cell length

Answer 30

2r

Question 31

fcc unit cell length

Answer 31

2rad2

Question 32

bcc unit cell length

Answer 32

4/rad3

Question 33

2d coordinate number

Answer 33

4

Question 34

sc coordinate number

Answer 34

6

Question 35

fcc coordinate number

Answer 35

12

Question 36

bcc coordinate number

Answer 36

8

Question 37

Atoms per unit cell 2d

Answer 37

1

Question 38

atoms per unit cell sc

Answer 38

1

Question 39

atoms per unit cell fcc

Answer 39

4

Question 40

atoms per unit cell bcc

Answer 40

2

Question 41

Atomic Packing Factor Formula

Answer 41

((2)(4/3)(r^3))/a^3 a = cell length

Question 42

Atomic packing factor sc

Answer 42

.52

Question 43

atomic packing factor fcc

Answer 43

.74

Question 44

atomic packing factor bcc

Answer 44

.68

Question 45

theoretical density formula

Answer 45

(atoms/unitcell)(g/mol)/(a^3)(6.022*10^23)

Question 46

Four Axis System

Answer 46

U = (1/3)(2u-v) V=(1/3)(2v-u) T = -(U+V) W=w

Question 47

Planes

Answer 47

Take reciprocal, reduce out of fraction

Question 48

X-ray defreaction

Answer 48

n(wavelength)=2dsin(angle)

Question 49

space between hkl

Answer 49

a/rad(h^2+k^2+l^2)

Question 50

defraction angle

Answer 50

2(theta)

Question 51

Vacancy

Answer 51

empty site in structure

Question 52

Equilibrium Vacancy Concentration

Answer 52

density = nA/(V_c)(N_A) = NA/(VN_A)

Question 53

N_v/N=exp(-Q_v/kT)

Answer 53

N_v = number of vaccants N= total atomic sites Q=Activation energy k = Boltzmans constant T = temperature

Question 54

interstitals

Answer 54

Extra atoms