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Announcements•If you don’t have a clicker with you, sign in after class•Check OWL announcements for information on exam makeups
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Intermolecular Forces
Ion-dipole Dipole-Dipole Dipole-Induced dipole Induced dipole-Induced dipole Hydrogen Bonding
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Induced Dipole- Induced Dipole Forces:
Between nonpolar molecules
Trends:
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Hydrogen Bonds: Between Molecules with F-H, O-H, or N-H
bonds
Trends:
C2H6O
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Which has strongest IMF?
1 2 3 4
25% 25%25%25%1. F2
2. Cl23. Br2
4. I2
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Which has the strongest IMF?
1 2
50%50%1. CH3CH3
2. CH3OH
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Hydrogen Bonding & The Unusual Properties of Water
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Hydrogen Bonding & The Unusual Properties of Water
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Boiling Points and Hydrogen Bonding
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Identifying IMF’s
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Relative Contributions of Different IMFs
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What are the most important IMF’s in propane?
1. Induced-dipole2. Dipole-dipole3. Hydrogen bonding
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What are the most important IMF’s in methanol?
1. Induced-dipole2. Dipole-dipole3. Hydrogen bonding
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What are the most important IMF’s in octanol?
1. Induced-dipole2. Dipole-dipole3. Hydrogen bonding
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Properties of Liquids
• Vapor Pressure (volatility)
• Boiling Point
• Enthalpy of Vaporization
• Viscosity
• Surface Tension
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Molecular interpretation of vapor pressure and boiling.
Enthalpy of vaporization:
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Clausius-Clapyron Equation: Vapor Pressure, Hvap, and T
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Graphical Method of Determining Enthalpy of Vaporization
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Example 2.
What is the mass of water in the air in this lecture hall?
14 m x 5 m x 17 mT = 22 oCHumidity = 43%
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Example 3.A 1-L flask of air is at 30 oC and relative humidity of 68%. The flask is put in a freezer and the temperature decreases to 5 oC. What happens?
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Surface Tension