LECTURE 2 (ME PREP)

Question 1

Rhodium has an FCC crystal structure, an atomic radius of 0.1345 nm and an atomic weight of 102.9 g/mol. Calculate the density of rhodium.

Answer 1

12.42 g/cm^3

Question 2

A group of atoms associated with a lattice point.

Answer 2

Basis

Question 3

It is a shorthand notation to describe crystallographic directions and planes in a material.

Answer 3

Miller indices

Question 4

The APF of an FCC crystal structure is ____.

Answer 4

0.74

Question 5

The density of gold is 19.31 g/cm3. If the metallic radius of gold is 407.9 pm, what is the structure of metallic gold?

Answer 5

FCC (show soln)

Question 6

The edge length of a BCC crystal structure is two times radius times the square root of 2. T or F

Answer 6

False (a= 4r/sqr root of 3)

Question 7

The coordinate number of a BCC unit cell is ____.

Answer 7

8

Question 8

How do crystals and amorphous solids differ?

Answer 8

Crystals produce regular shaped fragments when shattered and amorphous solids do not.

Question 9

Copper has a face-centered cubic unit cell. How many copper atoms are in each unit cell?

Answer 9

4

Question 10

Determine the density of BCC iron, which has a lattice parameter of 0.2866 nm.

Answer 10

7.879 g/cm^3

Question 11

The HCP crystal structure has 6 atoms in each unit cell. T or F

Answer 11

True

Question 12

Iron has a body-centered cubic unit cell. How many atoms of the metal are in each unit cell?

Answer 12

2

Question 13

A particular metal has a simple cubic unit cell. How many atoms of the metal are in each unit cell?

Answer 13

1

Question 14

Calculate the density of metallic copper, which has a face-centered cubic unit cell with an edge length of 361.5 pm.

Answer 14

8.935 g/cm^3