Problem 78
Explain how the evaporation of water acts as a coolant for the earth.
Problem 79
What do we mean when we say a liquid is volatile? Do volatile liquids have large or small vapor pressures? What types of intermolecular forces occur in highly volatile liquids?
Problem 80
Although methane, \(\mathrm{CH}_{4}\), and ammonia, \(\mathrm{NH}_{3}\), differ in molar mass by only one unit, the boiling point of ammonia is over \(100^{\circ} \mathrm{C}\) higher than that of methane (a nonpolar molecule). Explain.
Problem 81
Which type of solid is likely to have the highest melting point-an ionic solid, a molecular solid, or an atomic solid? Explain.
Problem 82
What types of intermolecular forces exist in a crystal of ice? How do these forces differ from the types of intermolecular forces that exist in a crystal of solid oxygen?
Problem 83
Discuss the electron sea model for metals. How does this model account for the fact that metals are very good conductors of electricity?
