Chapter 16: Q5DQ (page 704)
Does the nature of intermolecular forces change when a substance goes from a solid to a liquid or from a liquid to a gas? What causes a substance to undergo a phase change?
Yes, the nature of intermolecular forces changes when a substance changes from solid to liquid or from liquid to gas.
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Compare and contrast the phase diagrams of water and carbon dioxide. Why doesn’t have a normal melting pointand a normal boiling point, whereas water does? Theslopes of the solid/liquid lines in the phase diagrams of and are different. What do the slopes of the solid/liquid lines indicate in terms of the relative densities of the solid and liquid states for each substance? Howdo the melting points of role="math" localid="1663781921156" and depend on pressure? How do the boiling points of and depend on pressure? Rationalize why the critical temperature for is greater than that for.
How could you tell experimentally if TiO2 is an ionic solid or a network solid?
An ice cube tray contains enough water at to make ice cubes, each of which has a mass of The tray is placed in a freezer that uses as a refrigerant. The heat of vaporization of is . What mass of must be vaporized in the refrigeration cycle to convert all the water at role="math" localid="1663780868172" to ice at ? The heat capacities for and are and respectively, and the enthalpy of fusion for ice is .
It is possible to balance a paper clip on the surface of water in a beaker. If you add a bit of soap to the water, however, the paper clip will sink. Explain how the paper clip can float and why it sinks when soap is added
Compare and contrast the structures of the following solids.
a. CO2(s) and H2O(s)
b. NaCI(s) and CsCI(s)
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