Ch3 Questions (my answers)

Question 1

What do we need to define a 2D packed structure?

Answer 1

2 sides and 1 angle

Question 2

What do we need to define a 3D packed structure?

Answer 2

3 sides and 3 angles

Question 3

Between metals, ceramics, and polymers which has the highest
density and why?

Answer 3

Metals because they have closely packed atoms

Question 4

Theoretical density formula is nA/V_cN_A. What do these variables mean?

Answer 4

n = number of atoms/unit cell; A= atomic weight, V_c = a^3, N_A is avogadro’s number

Question 5

What is Bragg’s equation?

Answer 5

nλ= 2dSinθ

Question 6

d_(hkl)=

Answer 6

a/sqrt(h^2+k^2+l^2)

Question 7

Is diamond anisotropic or isotrophic? Why

Answer 7

anisotropic because it is directional