Ch.12 - Solids and Solid-State Materials
Chapter 12, Problem 51
Cesium chloride crystallizes in a cubic unit cell with Cl- ions at the corners and a Cs+ ion in the center. Count the numbers of + and - charges, and show that the unit cell is electrically neutral.
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Related Practice
Textbook Question
If a protein can be induced to crystallize, its molecular structure
can be determined by X-ray crystallography. Protein crystals,
though solid, contain a large amount of water molecules
along with the protein. The protein chicken egg-white lysozyme,
for instance, crystallizes with a unit cell having angles of
90° and with edge lengths of 7.9 * 103 pm, 7.9 * 103 pm,
and 3.8 * 103 pm. There are eight molecules in the unit
cell. If the lysozyme molecule has a molecular weight of
1.44 * 104 and a density of 1.35 g>cm3, what percent of the
unit cell is occupied by the protein?
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Textbook Question
Iron crystallizes in a body-centered cubic unit cell with an
edge length of 287 pm. Iron metal has a density of 7.86 g>cm3
and a molar mass of 55.85 g. Calculate a value for Avogadro's
number.
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Textbook Question
Sodium hydride, NaH, crystallizes in a face-centered cubic
unit cell similar to that of NaCl (Figure 12.11). How many
Na+ ions touch each H- ion, and how many H- ions touch
each Na+ ion?
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Textbook Question
If the edge length of an NaH unit cell is 488 pm, what is the
length in picometers of an Na¬H bond? (See Problem 12.50.)
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Textbook Question
Silicon carbide, SiC, is a covalent network solid with a structure
similar to that of diamond. Sketch a small portion of
the SiC structure.
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Textbook Question
Carbon and oxygen combine to form the molecular compound
CO2, while silicon and oxygen combine to form a
covalent network solid with the formula unit SiO2. Explain
the difference in bonding between the two group 4A elements
and oxygen.
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