91Ó°ÊÓ

What kinds of intermolecular forces are present in each substance? (a) \(\mathrm{Kr}\) (b) \(\mathrm{N}_{2}\) (c) \(\mathrm{CO}\) (d) \(\mathrm{HF}\)

What kinds of intermolecular forces are present in each substance? (a) \(\mathrm{NCl}_{3}\) (trigonal pyramidal) (b) \(\mathrm{NH}_{3}\) (trigonal pyramidal) (c) \(\mathrm{SiH}_{4}\) (tetrahedral) (d) \(\mathrm{CCl}_{4}\) (tetrahedral)

What kinds of intermolecular forces are present in a mixture of potassium chloride and water?

What kinds of intermolecular forces are present in a mixture of calcium bromide and water?

Which substance has the highest boiling point? Why? They are all nonpolar. (a) \(\mathrm{CH}_{4}\) (b) \(\mathrm{CH}_{3} \mathrm{CH}_{3}\) (c) \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{3}\) (d) \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2}\)

Which noble gas has the highest boiling point? Why? (a) \(\mathrm{Kr}\) (b) \(X_{e}\) (c) \(\mathrm{Rn}\)

One of these two substances is a liquid at room temperature and the other one is a gas. Which one is the liquid and why? \(\mathrm{CH}_{3} \mathrm{OH} \quad \mathrm{CH}_{3} \mathrm{SH}\)

One of these two substances is a liquid at room temperature and the other one is a gas. Which one is the liquid and why? $$ \mathrm{CH}_{3} \mathrm{OCH}_{3} \quad \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH} $$

For each pair of solids, determine which solid has the higher melting point and explain why. (a) \(\mathrm{Fe}(s)\) and \(\mathrm{CCl}_{4}(s)\) (b) \(\mathrm{KCl}(\mathrm{s})\) or \(\mathrm{HCl}(\mathrm{s})\) (c) \(\mathrm{TiO}_{2}(\mathrm{~s})\) or \(\mathrm{HOOH}(\mathrm{s})\)

The melting point of ionic solids depends on the magnitude of the electrostatic attractions that hold the solid together. Draw ionic Lewis structures for \(\mathrm{NaF}\) and \(\mathrm{MgO}\). Which do you think has the higher melting point?