Chapter 10: Q10.4-62 E (page 589)
Is it possible to liquefy nitrogen at room temperature (about 25 °C)? Is it possible to liquefy sulfur dioxide at room temperature? Explain your answers.
Nitrogen cannot be liquefied at room temperature, whereas Sulfur dioxide can be liquified.
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Identify the following substances as ionic, metallic, covalent network, or molecular solids: Substance A is malleable, ductile, conducts electricity well, and has a melting point of\({\rm{1135 ^\circ C}}\). Substance B is brittle, does not conduct electricity as a solid but does when molten, and has a melting point of\({\rm{2072 ^\circ C}}\). Substance C is very hard, does not conduct electricity, and has a melting point of\({\rm{3440 ^\circ C}}\). Substance D is soft, does not conduct electricity, and has a melting point of\({\rm{185 ^\circ C}}\).
Platinum (atomic radius \( = 1.38{A^o}\) ) crystallizes in a cubic closely packed structure. Calculate the edge length of the face-centered cubic unit cell and the density of platinum.
Titanium tetrachloride\(Ti{\rm{C}}{{\rm{l}}_4}\) has a melting point of\({\rm{23}}{\rm{.2}}^\circ {\rm{C}}\) and has a ΔH fusion =\(9.37\)kJ/mol.
(a) How much energy is required to melt \(263.1\)g\(Ti{\rm{C}}{{\rm{l}}_4}\)?
(b) For\(Ti{\rm{C}}{{\rm{l}}_4}\) which will likely have the larger magnitude: ΔH fusion or ΔH vaporization? Explain your reasoning.
The surface tension and viscosity values for diethyl ether, acetone, ethanol, and ethylene glycol are shown here
(a) Explain their differences in viscosity in terms of the size and shape of their molecules and their IMFs.
(b) Explain their differences in surface tension in terms of the size and shape of their molecules and their IMFs:
Lithium selenide can be described as a closest-packed array of selenide ions with lithium ions in all of the tetrahedral holes. What is the formula of lithium selenide
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