Quiz 1

Question 1

subatomic structure

Answer 1

electrons within the individual
atoms, their energies and interactions with nuclei

Question 2

atomic structure

Answer 2

relates to the organization of
atoms to yield molecules or crystals

Question 3

nanostructure

Answer 3

atoms that form particles
(nanoparticles) that have nanoscale dimensions
(<100 nm)

Question 3

microstructure

Answer 3

structural elements observed with
microscope

Question 4

macrostructure

Answer 4

structural elements seen with naked eye

Question 5

metal material type

Answer 5

-strong, ductile
-high thermal and electrical conductivities
-opaque, reflective

Question 6

polymer/plastic material type: compounds of non-metals

Answer 6

− Soft, ductile, low strengths, low densities
− Low thermal & electrical conductivities
− Opaque, translucent or transparent

Question 7

ceramic material type: compounds of metallic & non-metallic
elements (oxides, carbides, nitrides, sulfides)

Answer 7

− Hard, Brittle
− Low thermal & electrical conductivities
− Opaque, translucent, or transparent

Question 8

mechanical properties

Answer 8

relate deformation to an applied load or force (ex. strength, resistance to fracture)

Question 9

electrical properties

Answer 9

stimulus is an applied electric field (ex. conductivity, dielectric constant, resistivity)

Question 10

thermal properties

Answer 10

related to changes in a temperature or temperature gradients across a material (ex. heat capacity, thermal expansion, thermal conductivity)

Question 11

magnetic properties

Answer 11

responses of a material to application of a magnetic field (ex. magnetic susceptibility, permiability)

Question 12

optical properties

Answer 12

stimulus is electromagnetic or light radiation (ex. reflectivity, index of refraction)
-single crystal typically optically transparent, whereas polycrystalline can be translucent or opaque

Question 13

deteriorative properties

Answer 13

chemical reactivity of materials (ex. corrosion resistance)

Question 14

advanced materials

Answer 14

semiconductors, biomaterials, smart materials, nanomaterials

Question 15

Avogadro’s Number

Answer 15

1 mol = 6.022 x 10^23 atoms or molecules

Question 16

What properties are determined by atomic structure?

Answer 16

chemical, electrical, thermal, optical

Question 17

How do you calculate average atomic mass?

Answer 17

average mass = m1p1 + m2p2

Question 18

Which of the following is the best example of a
material property?

(a) Density
(b) Annealing
(c) Forging
(d) Single-crystal
(e) Crystalline

Answer 18

a) Density

Question 19

Which of the following is the best example of
material processing?

(a) Extrusion
(b) Crystalline
(c) Amorphous
(d) Glassy
(e) Elastic Modulus

Answer 19

a) Extrusion

Question 20

Which of the following is the best example of
material structure?

(a) Single-phase
(b) Elastic Modulus
(c) Sintering
(d) Magnetic Permeability
(e) Brittle

Answer 20

a) single-phase

Question 21

Which class of material is generally associated with
the highest density values at room temperature?

(a) Composites
(b) Ceramics
(c) Metals
(d) Polymers

Answer 21

c) metals

Question 22

Ionic Bonds

Answer 22

1. metal donates e- and nonmetal accepts e-
2. requires large EN difference
   ex. NaCl

Question 23

Covalent Bonding

Answer 23

1. Share valence electrons to fill shell
2. Similar ENs

Question 24

Metallic Bonding

Answer 24

electrons delocalized to form an "electron cloud"

Question 25

Primitive Unit Cell

Answer 25

Just one atom per unit cell (1 lattice point total)

Question 26

coordination number

Answer 26

number of nearest neighbors of an atom in a unit cell system

Question 27

Simple Cubic APF

Answer 27

0.52

Question 28

APF of BCC

Answer 28

0.68

Question 29

APF of FCC and HCP

Answer 29

0.74

Question 30

Coord Number of SC

Answer 30

6

Question 31

Coord Number of BCC

Answer 31

8

Question 32

Coord Number of FCC and HCP

Answer 32

12

Question 33

BCC Packing Direction parameter

Answer 33

4r=sqrt(3)a

Question 34

FCC Packing Direction parameter

Answer 34

4r=sqrt(2)a

Question 35

How many atoms in SC unit cell?

Answer 35

1 atom

Question 36

How many atoms in FCC unit cell?

Answer 36

4

Question 37

How many atoms in BCC unit cell?

Answer 37

2

Question 38

isotropic

Answer 38

for polycrystalline materials having randomly oriented grains, properties are independent of crystallographic orientation

Question 39

anisotropic

Answer 39

For most single crystals, properties vary with crystallographic orientation