MSE 250 EXAM 1 UPDATED QUESTIONS AND
CORRECT ANSWERS
Question:
1. SC
Answer:
1 atom/unit cell
Question:
2. BCC (Body Centered Cubic)
Answer:
2 atom/unit cell a=4r/sqrt(3) APF=.68
Question:
3. FCC (Face Centered Cubic)
Answer:
4 atom/unit cell a=4r/sqrt(2) APF=.74
Question:
4. BCC on (111)
Answer:
(1/2)pir^2/(8/sqrt(3))r^2=sqrt(3)pi/16
Question:
5. Area Packing Factor
Answer:
Area of atoms on plane/area of plane
Question:
6. Octahedral faces&vertex
Answer:
8 faces 6 vertex
Question:
7. Tetrahedral Vertex
Answer:
4 vertex
Question:
8. Copolymer
Answer:
Two or more repeat units
Question:
9. Homopolymer
CORRECT ANSWERS
Question:
1. SC
Answer:
1 atom/unit cell
Question:
2. BCC (Body Centered Cubic)
Answer:
2 atom/unit cell a=4r/sqrt(3) APF=.68
Question:
3. FCC (Face Centered Cubic)
Answer:
4 atom/unit cell a=4r/sqrt(2) APF=.74
Question:
4. BCC on (111)
Answer:
(1/2)pir^2/(8/sqrt(3))r^2=sqrt(3)pi/16
Question:
5. Area Packing Factor
Answer:
Area of atoms on plane/area of plane
Question:
6. Octahedral faces&vertex
Answer:
8 faces 6 vertex
Question:
7. Tetrahedral Vertex
Answer:
4 vertex
Question:
8. Copolymer
Answer:
Two or more repeat units
Question:
9. Homopolymer