Ch.12 - Solids and Solid-State Materials
Chapter 12, Problem 68
State whether each of the following compounds is likely to have a liquid crystalline phase. Explain your reasoning. (a)
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Related Practice
Textbook Question
The melting point of sodium metal is 97.8 °C, and the melting
point of sodium chloride is 801 °C. What can you infer
about the relative strength of metallic and ionic bonding
from these melting points?
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Textbook Question
Sodium melts at 98 °C, and magnesium melts at 650 °C.
Account for the higher melting point of magnesium using
the electron-sea model.
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Textbook Question
Draw an MO energy-level diagram that shows the population
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Textbook Question
Draw an MO energy-level diagram for beryllium metal, and
show the population of the MOs for the following two cases.
(a) The 2s and 2p bands are well separated in energy.
(b) The 2s and 2p bands overlap in energy.
Which diagram agrees with the fact that beryllium has a
high electrical conductivity? Explain.
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Textbook Question
The melting points for the second-series transition elements
increase from 1522 °C for yttrium to 2623 °C for molybdenum
and then decrease to 321 °C for cadmium. Account for
the trend using band theory.
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Textbook Question
Tungsten is hard and has a very high melting point
(3422 °C), and gold is soft and has a relatively low melting
point (1064 °C). Are these facts in better agreement with the
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