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Chapter 10: Q73E. (page 592)
Substance A is shiny, conducts electricity well, and melts at 975 掳C. Substance A is likely a(n): (a) ionic solid (b) metallic solid (c) molecular solid (d) covalent network solid
The substance A is metallic solid.
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Identify the type of crystalline solid (metallic, network covalent, ionic, or molecular) formed by each of the following substances:
\(\begin{array}{l}{\rm{(a)CaC}}{{\rm{l}}_{\rm{2}}}\\{\rm{(b)SiC}}\\{\rm{(c)}}{{\rm{N}}_{\rm{2}}}\\{\rm{(d)Fe}}\\{\rm{(e)C(graphite)}}\\{\rm{(f)C}}{{\rm{H}}_{\rm{3}}}{\rm{C}}{{\rm{H}}_{\rm{2}}}{\rm{C}}{{\rm{H}}_{\rm{2}}}{\rm{C}}{{\rm{H}}_{\rm{3}}}\\{\rm{(g)HCl}}\\{\rm{(h)N}}{{\rm{H}}_{\rm{4}}}{\rm{N}}{{\rm{O}}_{\rm{3}}}\\{\rm{(i)}}{{\rm{K}}_{\rm{3}}}{\rm{P}}{{\rm{O}}_{\rm{4}}}\end{array}\)
Identify the type of crystalline solid (metallic, network covalent, ionic, or molecular) formed by each of the following substances:
\(\begin{aligned}{\rm{(a)Si}}{{\rm{O}}_{\rm{2}}}\\{\rm{(b)KCl}}\\{\rm{(c)Cu}}\\{\rm{(d)C}}{{\rm{O}}_{\rm{2}}}\\{\rm{(e)C(diamond)}}\\{\rm{(f)BaS}}{{\rm{O}}_{\rm{4}}}\\{\rm{(g)N}}{{\rm{H}}_{\rm{3}}}\\{\rm{(h)N}}{{\rm{H}}_{\rm{4}}}{\rm{\;F}}\\{\rm{(i)}}{{\rm{C}}_{\rm{2}}}{{\rm{H}}_{\rm{5}}}{\rm{OH}}\end{aligned}\)
The test tubes shown here contain equal amounts of the specified motor oils. Identical metal spheres were dropped at the same time into each of the tubes, and a brief moment later, the spheres had fallen to the heights indicated in the illustration. Rank the motor oils in order of increasing viscosity, and explain your reasoning:
Dry ice, \({\rm{C}}{{\rm{O}}_{\rm{2}}}{\rm{(s)}}\), does not melt at atmospheric pressure. It sublimes at a temperature of \({\rm{ - 7}}{{\rm{8}}^{\rm{o}}}{\rm{C}}\). What is the lowest pressure at which \({\rm{C}}{{\rm{O}}_{\rm{2}}}{\rm{(s)}}\) will melt to give \({\rm{C}}{{\rm{O}}_{\rm{2}}}{\rm{(l)}}\)? At approximately what temperature will this occur? (See Figure \({\rm{10}}{\rm{.34}}\) for the phase diagram.)
Identify two common observations indicating some solids, such as dry ice and mothballs have vapour pressures sufficient to sublime.
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