Chapter 12: Problem 38
A solid is very hard and has a high melting point. Neither the solid nor its melt conducts electricity. Classify the solid.
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The liquid-vapor boundary line in the phase diagram of any substance always stops abruptly at a certain point. Why?
Which of these are molecular solids and which are covalent solids: \(\mathrm{Se}_{8}, \mathrm{HBr}, \mathrm{Si}, \mathrm{CO}_{2}, \mathrm{C}, \mathrm{P}_{4} \mathrm{O}_{6}, \mathrm{~B},\) \(\mathrm{SiH}_{4} ?\)
These compounds are liquid at \(-10^{\circ} \mathrm{C}\); their boiling points are given: butane, \(-0.5^{\circ} \mathrm{C}\); ethanol, \(78.3^{\circ} \mathrm{C}\); toluene, \(110.6^{\circ} \mathrm{C}\). At \(-10^{\circ} \mathrm{C}\), which of these liquids would you expect to have the highest vapor pressure? Which the lowest?
Define these terms: (a) molar heat of vaporization, (b) molar heat of fusion, (c) molar heat of sublimation. What are their units?
Diethyl ether has a boiling point of \(34.5^{\circ} \mathrm{C},\) and I-butanol has a boiling point of \(117^{\circ} \mathrm{C}\) Both of these compounds have the same numbers and types of atoms. Explain the difference in their boiling points.
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