Homework 12 Key

Homework 12 Key - the molecules in the vapor phase...

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CHEM 1515 Homework 12 Key End-of-Chapter Problems
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Review and Discussion Questions 1. Under the initial conditions, the water is a liquid. As the temperature is increased, the molecules gain kinetic energy, and an increasing fraction of the water molecules have enough kinetic
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energy to escape into the gas phase, thereby increasing the vapor pressure. At a little over 80 °C, this increased vapor pressure has increased to the point that it equals the ambient atmospheric pressure, and thus bubbles of pure vapor that might form within the liquid can sustain themselves against that external pressure. This is known as boiling. As further heat is added, the fraction of
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Unformatted text preview: the molecules in the vapor phase increases through boiling until all of the liquid has evaporated. At that point, the temperature of the water vapor can then increase due to any further applied heat. 4. Under these conditions, the rate of evaporation is greater than the rate of condensation. Thus, any condensed liquid will evaporate. 8. Evaporation is easier, and therefore faster, when the intermolecular attractions that must be overcome are weaker. This increases the fraction of the molecules that are in the vapor phase, and thus increases the vapor pressure. Challenge Questions...
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This note was uploaded on 01/08/2012 for the course CHEM 1515 taught by Professor White during the Fall '11 term at Oklahoma State.

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Homework 12 Key - the molecules in the vapor phase...

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