Chapter 10: Q79E. (page 592)
Cobalt metal crystallizes in a hexagonal closest packed structure. What is the coordination number of a cobalt atom?
The coordination number of cobalt in hexagonal closest packing structure is 12.
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Carbon tetrachloride, \({\rm{CC}}{{\rm{l}}_{\rm{4}}}\), was once used as a dry-cleaning solvent, but is no longer used because it is carcinogenic. At \({\bf{57}}.{\bf{8}}\)°C, the vapor pressure of \({\rm{CC}}{{\rm{l}}_{\rm{4}}}\) is \({\bf{54}}.{\bf{0}}\)kPa, and its enthalpy of vaporization is \({\bf{33}}.{\bf{05}}\)kJ/mol. Use this information to estimate the normal boiling point for \({\rm{CC}}{{\rm{l}}_{\rm{4}}}\).
What types of liquids typically form amorphous solids?
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:
Proteins are chains of amino acids that can form in a variety of arrangements, one of which is a helix. What kind of IMF is responsible for holding the protein strand in this shape? On the protein image, show the locations of the IMFs that hold the protein together:
Which contains the compounds listed correctly in order of increasing boiling points
\(\begin{aligned}{\rm{(a)}}{{\rm{N}}_{\rm{2}}}{\rm{ < C}}{{\rm{S}}_{\rm{2}}}{\rm{ < }}{{\rm{H}}_{\rm{2}}}{\rm{O < KCl}}\\{\rm{(b)}}{{\rm{H}}_{\rm{2}}}{\rm{O < }}{{\rm{N}}_{\rm{2}}}{\rm{ < C}}{{\rm{S}}_{\rm{2}}}{\rm{ < KCl}}\\{\rm{(c)}}{{\rm{N}}_{\rm{2}}}{\rm{ < KCl < C}}{{\rm{S}}_{\rm{2}}}{\rm{ < }}{{\rm{H}}_{\rm{2}}}{\rm{O}}\\{\rm{(d)C}}{{\rm{S}}_{\rm{2}}}{\rm{ < }}{{\rm{N}}_{\rm{2}}}{\rm{ < KCl < }}{{\rm{H}}_{\rm{2}}}{\rm{O}}\\{\rm{(e)KCl < }}{{\rm{H}}_{\rm{2}}}{\rm{O < C}}{{\rm{S}}_{\rm{2}}}{\rm{ < }}{{\rm{N}}_{\rm{2}}}\end{aligned}\)
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