mG-1

Question 1

Which material has the highest density? What is the value?

Answer 1

Platinum, 20 g/cm^3

Question 2

Which materials are insulators?

Answer 2

Polymers & ceramics

Question 3

Which materials do well with cracks?

Answer 3

Metals

Question 4

Provide the two classes of bonds with qualitative energies.

Answer 4

Primary 100,000kJ/mol , secondary 10,000kJ/mol

Question 5

Provide the specific bonds of the two classes.

Answer 5

Primary - ionic, covalent, metallic

Secondary - Hydrogen bonding, dipole, van der waals

Question 6

Which bonds are non-directional?

Answer 6

ionic & metallic

Question 7

Which bonds are directional?

Answer 7

covalent & secondary

Question 8

What is the MSE motto?

Answer 8

Processing, Structure, Properties, Performance

Question 9

What is steel’s young’s modulus (stiffness)?

Answer 9

about 200 GPa

Question 10

What are the types of properties in MSE?

Answer 10

mechanical, electrical, thermal, magnetic, optical, deteriorative

Question 11

What does a deeper trough correspond with on the EvR graph?

Answer 11

higher melting point

Question 12

What does a larger well width correspond with on the EvR graph?

Answer 12

larger coefficient of thermal expansion

Question 13

What does the peak of the graph on the FvR correspond with?

Answer 13

ultimate strength

Question 14

What does the slope of the FvR graph correspond with?

Answer 14

young’s modulus (stiffness)

Question 15

What is the APF for Simple Cubic?

Answer 15

52%

Question 16

What is the APF for Body Centered Cubic?

Answer 16

68%

Question 17

What is the APF for Face Centered Cubic?

Answer 17

74%

Question 18

What is the APF for Hexagonal Close-Packed?

Answer 18

74%

Question 19

How many atoms (n) in the Simple Cubic?

Answer 19

1

Question 20

How many atoms (n) in the Body Centered Cubic?

Answer 20

2

Question 21

How many atoms (n) in the Face Centered Cubic?

Answer 21

4

Question 22

How many atoms (n) in the Hexagonal Close-Packed?

Answer 22

6

Question 23

Side length of SC?

Answer 23

2r

Question 24

Side length of BCC?

Answer 24

4r/sqrt(3)

Question 25

Side length of FCC?

Answer 25

2sqrt(2)r

Question 26

Side length of HCP?

Answer 26

2r

Question 27

CN for SC?

Answer 27

6

Question 28

CN for BCC?

Answer 28

8

Question 29

CN for FCC?

Answer 29

12

Question 30

CN for HCP?

Answer 30

12

Question 31

What is an angstrom?

Answer 31

10^-10 m

Question 32

What is the equation for theoretical density?

Answer 32

p=nA/VN, n: number of atoms in cell, A: atomic weight, V: volume of cell, N: avogadro’s number, 6.022*10^23 atoms/mol

Question 33

What does atomic number mean?

Answer 33

The number of protons in the nucleus (determines the element)

Question 34

What does having a large electronegativity value mean?

Answer 34

tendancy to aquire electrons

Question 35

Explain the electronegativity trend of the periodic table.

Answer 35

It goes up and to the right (except for the noble gases)

Question 36

Explain metallic bonding

Answer 36

sea of electrons mixed into ion cores

Question 37

How do ceramics bond?

Answer 37

ionic and covalent

Question 38

How do metals bond?

Answer 38

metallic bonding

Question 39

How do polymers bond?

Answer 39

covalent and secondary