Materials HW 1

Match the material classification or sub-classification to its corresponding example.

Metals

Titanium

Match the material classification or sub-classification to its corresponding example.

Ceramics

NaCl

Match the material classification or sub-classification to its corresponding example.

Composites

Carbon Fiber Reinforced Plate

Match the material classification or sub-classification to its corresponding example.

Bio-materials

Artificial Bone

Match the material classification or sub-classification to its corresponding example.

Polymers

PVC

Smart materials

Shape memory alloy

What is different about the angstrom when compared to other SI prefixes

SI prefixes can be used for any unit, but angstroms are specific to meters

Order the SI prefixes from smallest to largest

1. Pico

2. Micro

3. Milli

4. Mega

5. Giga

Match the system with it's type of bonding using electronegativities

Fe-Ni

Metallic

Match the system with its type of bonding using electronegativities

H-F

Ionic

Match the system with it's type of bonding using electronegativities

Si-C

Polar Covalent

Match the system with it's type of bonding using electronegativities

K-Cl

Ionic

Match the system with it's type of bonding using electronegativities

Na-Cl

Ionic

Match the system with it's type of bonding using electronegativities

Mn-Co

Metallic

Match the system with it's type of bonding using electronegativities

C-C

Covalent

Match the system with it's type of bonding using electronegativities

Sn-S

Polar Covalent

Match the system with it's type of bonding using electronegativities

Si-P

Covalent

Match the system with it's type of bonding using electronegativities

Ni-Ni

Metallic

Match the system with it's type of bonding using electronegativities

B-N

Polar Covalent

Match the system with it's type of bonding using electronegativities

Al-Mg

Metallic

Following periodic table trends, order the atomic radius from largest to smallest (you don't need to look up the actual values!)

(Mo S Ba Cu)

Largest

1. Ba

2. Mo

3. Cu

4. S

   Smallest

Following periodic table trends, order the atomic radius from largest to smallest (you don't need to look up the actual values!)

(Co Cl Al Sr)

Largest

1. Sr

2. Co

3. Al

4. Cl

   Smallest

What type of bond is both directional and dictated by the shapes of orbitals?

Covalent bonding

What type of bond is both non-directional and limited by like charge repulsion?

Ionic bonding

What type of bond is both non-directional and leads to highly dense packing?

Metallic Bonding

c

Which specific secondary bond is both the weakest, and is due to temporary electron cloud asymmetry in non-polar atoms and molecules?

Induced Dipole

Which specific type of secondary bonding occurs between to polar molecules, and is especially effective when hydrogen is involved?

Permanent Dipole Bonds

Which sample material has the shortest equilibrium bond length?

a

b

c

d

b

Which of the sample materials should have the lowest melting point?

a

b

c

d

d

Which sample material should have the highest melting point?

a

b

c

d

a

Which statement is true concerning Bravais lattices and crystal systems?

There are 7 crystal systems and 14 Bravais lattices

Which term correctly describes the following image of atomic packing?

Amorphous

Which term correctly describes this following image of atomic packing?

Polycrystalline

Using the conventional naming methods for Miller Indices, what is the direction shown on the unit cell below? (Negatives are denoted by an underline instead of an overline due to Canvas limitations)

[111]

Using the conventional naming methods for Miller Indices, what is the direction shown on the unit cell below? (Negatives are denoted by an underline instead of an overline due to Canvas limitations)

[111]

Using the conventional naming methods for Miller Indices, what is the direction shown on the unit cell below? (Negatives are denoted by an underline instead of an overline due to Canvas limitations)

[111]

Using the conventional naming methods for Miller Indices, what is the direction shown on the unit cell below? (Negatives are denoted by an underline instead of an overline due to Canvas limitations)

[101]

Using the conventional naming methods for Miller Indices, what is the direction shown on the unit cell below? (Negatives are denoted by an underline instead of an overline due to Canvas limitations)

[011]

Using the conventional naming methods for Miller Indices, what is the direction shown on the unit cell below? (Negatives are denoted by an underline instead of an overline due to Canvas limitations)

[110]

Now for something a little more challenging. This is a non-cubic lattice. Name the direction.

[122]

This last one is tricky. Notice I've given you the lattice parameters this time. Name the direction depicted in this non-cubic unit cell.

[011]

Using the conventional naming methods for Miller Indices, what is the plane shown on the unit cell below? (Negatives are denoted by an underline instead of an overline due to Canvas limitations)

(111)

Using the conventional naming methods for Miller Indices, what is the plane shown on the unit cell below?

(110)

Using the conventional naming methods for Miller Indices, what is the plane shown on the unit cell below?

(101)

Using the conventional naming methods for Miller Indices, what is the plane shown on the unit cell below?

(101)

Using the conventional naming methods for Miller Indices, what is the plane shown on the unit cell below?

(111)

Using the conventional naming methods for Miller Indices, what is the plane shown on the unit cell below?

Plane on a cube

from top back left to top front right to bottom front left

(111)

Now let's try a harder one with planes. Again, this is a non-cubic lattice. Name that plane.

(112)

What family of planes in a metallic crystal structure is depicted in the image below?

{110} BCC

How many atoms are there in the metallic BCC unit cell?

1

2

3

4

2

How many atoms are there in the metallic FCC unit cell?

1

2

3

4

4

How many atoms are there in the non-extended metallic HCP unit cell?

1

2

3

4

2

Which metallic crystal structure(s) have an atomic packing factor (APF) of 0.74, the theoretical maximum for same-size spheres filling 3-D space?  

FCC and HCP

Calculate the linear packing factor of the [110] direction for an BCC unit cell (answer as a decimal, not a percentage).

0.612

Calculate the linear packing factor of the [100] direction for an BCC unit cell (answer as a decimal, not a percentage).

0.866

Calculate the linear packing factor of the [111] direction for an FCC unit cell (answer as a decimal, not a percentage).

0.408

Calculate the linear packing factor of the [100] direction for an FCC unit cell (answer as a decimal, not a percentage).

0.707

Calculate the planar packing factor for the BCC unit cell in the (110) plane (answer as a decimal, not a percentage).

0.833

Calculate the planar packing factor for the BCC unit cell in the (100) plane (answer as a decimal, not a percentage).

0.589

An unidentified metal has an atomic weight of 176.8 g/mol, an FCC structure, and an atomic radius 0.20 nm . Calculate the theoretical density

6.488 g/cm³