Homework 2

# Homework 2 - 4 Callister 3.12 On the basis of ionic charge...

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ENMA 300 Homework 2 Due: Monday, Sept. 19, 2011 1. Callister 3.3 Molybdenum has a BCC crystal structure, an atomic radius of 0.1363 nm, and an atomic weight of 95.94 g/mol. Compute its theoretical density and compare it with the experimental value found inside the front cover. 2. Callister 3.7 Below are listed the atomic weight, density and atomic radius for three hypothetical metals. For each determine whether its crystal structure is FCC, BCC or simple cubic and then justify your determination. A simple cubic unit cell is shown in Figure 3.42. Alloy Atomic Weight (g/mol) Density (g/cm 3 ) Atomic Radius (nm) A 43.1 6.40 0.122 B 184.4 12.30 0.146 C 91.6 9.60 0.137 3. Callister 3.11 Demonstrate that the minimum cation-to-anion radius ratio for number of 8 is 0.732
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Unformatted text preview: 4. Callister 3.12 On the basis of ionic charge and ionic radii, predict crystal structures for the following materials: (a) CaO (b) KBr. Justify your selections. Include why it is appropriate to use ionic charge and ionic radii in your justification. 5. Callister 3.17 A hypothetical AX type of ceramic material is known to have a density of 2.10 g/cm 3 and a unit cell of cubic symmetry with a cell edge length of 0.57 nm. The atomic weights of the A and X elements are 28.5 and 30.0 g/mol, respectively. On the basis of this information, which of the following crystal structures is (are) possible for this material: sodium chloride, cesium chloride, or zinc blende? Justify your choice(s)....
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