Consider the crystal structure for pyrite (FeS2), also known as Fool’s gold, shown here.  Iron atoms are the larger brown spheres, while sulfur atoms are the smaller yellow spheres, as labelled.  This image depicts the cubic unit cell and all atoms shown here are at least PARTIALLY within this unit cell.  Based on this depiction, if you wanted to calculate the theoretical density of the material, how many of each atom would you count as being “fully inside” the unit cell?   Hint: The iron atoms sit on face-centered lattice sites.  

If a crystal structure is found to have ALL of its lattice parameters equal to each other (a = b = c), to which of these crystal classes might it belong? i. Cubic ii. Tetragonal iii. Hexagonal

Which of the following statements is true about a material within space group P6mm? 

How would you notate the SINGLE direction for “uvw”? (NOT the family.)

Which of these images best shows the direction?     

In the force-bond distance curve shown above, which feature best describes the equilibrium bond length for the material at zero Kelvin? 

Which of these planes is the   ?    

What fraction of an atom sitting on the “corner” of a 3-dimensional cubic unit cell would be counted as being part of that unit cell?  (For example if you were counting atoms to calculate the theoretical density in that unit cell.)

In the United States today, the minimum reserve ratio for checkable bank deposits is 5.7% B.  10%           C.  15%           D.  20%

Again according to, “Consider This: Ratchet Effect,” the price level in the United States over the past 62 years has fallen only     A.   once        B. twice          C. six times          D. 14 times