Lect%2012%20%20States%20of%20Matter-Intermolecular%20Forces

Lect%2012%20%20States%20of%20Matter-Intermolecular%20Forces...

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States of Matter Gases are compressible fluids. Their molecules are widely separated. Liquids are relatively incompressible fluids. Their molecules are more tightly packed. Solids are nearly incompressible and rigid. Their molecules or ions are in close contact and do not move.
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States of Matter
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Changes of State A change of state or phase transition is a change of a substance from one physical state to another.
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Vaporization and Condensation at Equilibrium
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Boiling of a Liquid
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Heat of Phase Change H 2 O(l) H 2 O(g)  vap = 40.7 kJ/mol H 2 O(s) H 2 O(l)  fusion = 6.01 kJ/mol
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Problem The heat of vaporization of ammonia is 23.4 kJ/mol. How much heat is required to vaporize 1.00 kg of ammonia?
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Heating Curve for Water
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Vapor pressure of a liquid always increases with increase in temperature. The mathematical dependence of vapor pressure on temperature is described by the Clausius- Clapeyron Equation The logarithm of the vapor pressure of a liquid varies linearly with absolute temperature.
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Lect%2012%20%20States%20of%20Matter-Intermolecular%20Forces...

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