Ch.11 - Liquids & Phase Changes
Chapter 11, Problem 21
Water flows quickly through the narrow neck of a bottle, but maple syrup flows sluggishly. Is this different behavior due to a difference in viscosity or in surface tension for the liquids?
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Textbook Question
Assume that you have a liquid in a cylinder equipped with a movable piston. There is no air in the cylinder, the volume of space above the liquid is 200 mL, and the equilibrium vapor pressure above the liquid is 28.0 mm Hg. What is the equilibrium pressure above the liquid when the volume of space is decreased from 200 mL to 100 mL at constant temperature?
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Textbook Question
A phase diagram for a substance that exhibits the liquid
crystalline state is shown.
(b) If the substance is at a temperature and pressure repre- sented by point 1 and the temperature is increased until the phase changes, what is the phase transition? Describe how the ordering of molecules changes, and propose a reason for the change.
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Textbook Question
The following compound undergoes a phase transition from the solid to the smectic liquid crystal phase at 121 °C. Upon further heating, the compound undergoes another transition to liquid phase at 131 °C.
(a) Which image represents the arrangement of molecules at 125 °C?
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Textbook Question
Predict which substance in each pair has the highest surface tension.
(a) CCl4 or CH2Br2
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Textbook Question
Predict which substance in each pair has the highest viscosity. (a) Hexane 1CH3CH2CH2CH2CH2CH32 or 1-hexanol 1CH3CH2CH2CH2CH2CH2OH2
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Textbook Question
Predict which substance in each pair has the highest viscosity. (b) Pentane or neopentane
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