Download Cubic Unit Cells - MiniQuiz (KEY) Read the questions below, circle

Cubic Unit Cells - MiniQuiz (KEY)
Read the questions below, circle your answer choice and explain the reasoning &/or
calculations that led to your answer choice.
Use any or all of the lines in the last column for your explanations/calculations - you may
use all five if you need to, since you have already circled your answer choice in the
previous column.
1. Lithium metal has a body-centered cubic unit cell. How many lithium atoms are there in one
unit cell?
Circle
Reason: Use as many lines as needed.
A)
1
B)
(2)
C)
3
but only 1/8th of each atom is within the unit cell
D)
4
That makes 8 x ⅛ = 1
E)
8
There is 1 other whole atom in the center ---- 1 + 1 = (2)
There are 8 corners.
There is one atom in every one of these 8 corners,
2. Copper crystallizes in a face-centered cubic lattice. How many copper atoms are there per
unit cell?
Circle
Reason: Use as many lines as needed.
A)
1
There are 8 corners, with one atom in every one of these 8 corners.
B)
2
1/8th of each atom is within the unit cell, making 8 x ⅛ = 1
C)
(4)
D)
8
½ of each atom is within the unit cell, making 6 x ½ = 3
E)
12
1 + 3 = (4)
There are 6 faces, with one atom in every one of these 6 faces
3. In a face centered cubic lattice, how many unit cells is each unit cell shared equally by?
Circle
Reason: Use as many lines as needed.
A)
2
There are 6 faces on every unit cell
B)
4
Each of these 6 faces is shared by a face of 1 adjacent unit cell
C)
(6)
D)
8
E)
10
6 x 1 = (6) other unit cells
4. Copper crystallizes in a simple cubic lattice. How many iron atoms are there per unit cell?
Circle
Reason: Use as many lines as needed.
A)
(1)
B)
2
There is one atom in every one of these 8 corners,
C)
3
but only 1/8th of each atom is within the unit cell
D)
4
That makes 8 x ⅛ = 1
E)
8
There are 8 corners.
Include if lesson was started with bond types:
5. Which one, if any, of the following is NOT an example of a Covalent Network Solid (CNS)?
Circle
Reason: Use as many lines as needed.
A)
diamond
B)
SiO
C)
Ge
So they all contain covalent bonds.
D)
graphite
None of them exist as molecules…
E)
All are CNS
That means they all form networks.
2
All five are composed of non-metals only…