quiz4key - CHEMISTRY 131 Quiz #4 Due: Wednesday, February...

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CHEMISTRY 131 Quiz #4 Due: Wednesday, February 22, 2006 Name: ______________Key_______________________ 1. Show that the percent occupation of a bcc lattice is 68%. (3 points) % occupation = V atoms V cell bcc : 2 atoms / cell V atoms = 2 atoms x 4 π r 3 3 = 8 π r 3 3 body diagonal = ( ) side = 4 r ; side = 4 r 3 V cell = side 3 = 4 r 3 3 = 64 r 3 occupation = 8 π r 3 3 64 r 3 3 3 = 8 π r 3 ( ) 3 3 ( ) 3 ( ) 64 r 3 ( ) = π 8 = 0.68 2. Briefly explain the structural similarities and differences among the sphalerite, rock salt, and fluorite structure types. (2 points) The sphalerite, rock salt, and fluorite structure types are all similar in that they are all based on the fcc unit cell. Sphalerite and rock salt are also similar because they are both 1:1 structures. However, each has a different arrangement of ions. The sphalerite structure consists of one type of ion at the lattice sites with the other type of ion located in half of the tetrahedral holes of the structure. The rock salt structure has one type of ion at the lattice sites with the other type of ion located in
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This homework help was uploaded on 04/18/2008 for the course CHEM 131 taught by Professor Landry during the Spring '08 term at Vermont.

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quiz4key - CHEMISTRY 131 Quiz #4 Due: Wednesday, February...

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