QI. Calculate the linear density of directions [011] for BCC, and FCC crystal structures?

G.281.

Classify each of the following substances, in the solid state, as molecular, ionic, covalent network or metallic.   Substance Appearance Melting Pt. (°C) Boiling Pt. (°C) Conducts as solid Conducts as liquid A grey 795 3468 yes yes B colorless crystals 87 220 no no C colorless crystals 1713 2230 no no D yellowish hexagonal crystal 740 1100 no yes   Question 9 options:   a  b c d 1. metallic 2. molecular 3. covalent network 4. ionic

5)

Cubic ZnS structure. Calculate the cohesive energy of KCl in the cubic ZnS (zincblende, FCC with a basis) structure. Compare with the value of the cohesive energy of KCl in the NaCl structure. Use the values of the repulsive energy and range parameters from Kittel Chap 3 Table 7, and the given values of the Madelung constant: {NaCl,CsCl,ZnS} = {1.747565,1.762675,1.6381}

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