Announcements If you don’t have a clicker with you, sign in after class If you don’t have a clicker with you, sign in after class This week: Chapter 11.

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Presentation transcript:

Announcements If you don’t have a clicker with you, sign in after class If you don’t have a clicker with you, sign in after class This week: Chapter 11 Intermolecular Forces (OWL homework due 2/28) This week: Chapter 11 Intermolecular Forces (OWL homework due 2/28) Exam #1 Results: Exam #1 Results: Average: 68

Chapter 11Chapter 11 Intermolecular Forces and the Liquid State

Intermolecular Forces  Properties Molecular Geometry  Polarity Formula  Lewis Structure  Electron Geometry

What happens when water boils? Draw a picture. Bonding vs. Intermolecular Forces Where do IMF’s come from?

Types of Forces Between Molecules Intermolecular Forces (IMF’s)

Ion-Dipole Forces: Between dissolved ions and polar molecule s  Enthalpy of hydration:  Trends:

Which would have the highest  H hyd ? 1.Li + 2.Na + 3.K + 4.Ca 2+ 5.Al 3+

Dipole-Dipole Forces: Between polar molecules  Trends:

Dipole- Induced Dipole Forces: Between polar and nonpolar molecules  Trends:

Induced Dipole- Induced Dipole Forces: Between nonpolar molecules  Trends:

Hydrogen Bonds: Between Molecules with F-H, O-H, or N-H bonds  Trends: C2H6OC2H6O

Which has strongest IMF?Which has strongest IMF? 1.F 2 2.Cl 2 3.Br 2 4.I 2

Which has the strongest IMF? 1.CH 3 CH 3 2.CH 3 OH

Hydrogen Bonding: Properties of water

More on Boiling Points and Hydrogen Bonding

Identifying IMFs

Relative Contributions of Different IMFs

Properties of Liquids Vapor Pressure (volatility) Boiling Point Enthalpy of Vaporization Viscosity Surface Tension

Molecular interpretation of vapor pressure and boiling. Enthalpy of vaporization:

Clausius-Clapyron Equation: Vapor Pressure,  H vap, and T

Graphical Method of Determining Enthalpy of Vaporization

Example 2. What is the mass of water in the air in this lecture hall? 14 m x 5 m x 17 m T = 22 o C Humidity = 43%

Example 3. A 1-L flask of air is at 30 o C and relative humidity of 68%. The flask is put in a freezer and the temperature decreases to 5 o C. What happens?

Surface Tension