lecture20_chem110_sas

lecture20_chem110_sas - Chapter 11: Intermolecular Forces...

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Chapter 11: Intermolecular Forces CH110 FA11 SAS 1 Exam 2 Monday, October 10, 2011, 6:30 PM Prepare for Recitation October 13 th ALEKS Objective 7 due October 8 th ANGEL Quiz 7, October 9 th Note the special due dates! Lecture 19: October 5 th Lecture 20: October 7 th Lecture 21: October 10 th (Review for Exam) Read: Ch. 11.1,11.2,11.6,25.2-25.4 Additional Preparation: BLB 11 : 15,17,21,25; Packet : 1-4 Packet Organic : 1-9
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CH110 FA11 SAS 2 By the end of Today’s Lecture you should know: Electrostatic interactions Dispersion forces Dipole-Dipole interactions Hydrogen bonds (H-bonds) KEY QUESTIONS: THE BIG PICTURE Chapter 11: Intermolecular Forces What are the differences between solids, liquids and gasses? How strong are the forces between molecules compared to the forces within molecules? Remember: Chemistry connects microscopic properties with macroscopic observables. Why can identical molecules exist in different phases of matter? What effect does the phase of matter have on the physical properties associated with a molecule?
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Conceptual Overview CH110 FA11 SAS 3 Determine Chemical Formula (Empirical, molecular, or structural) Lewis structures Molecular geometry Molecular polarity Geometry and polarity determine function. Now we understand some of the forces inside molecules that determine their structure and reactivity . What are the forces between molecules ( microscopic ) that produce the physical properties we experience ( macroscopic )?
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Physical Properties Example: The Phases of Matter CH110 FA11 SAS 4 Gas Liquid Solid Shape & Volume Compress Diffusion Flow assumes volume & shape of container assumes shape of container has its own shape & volume yes no no rapid slow very slow readily readily no
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Kinetic Energy and Intermolecular Forces CH110 FA11 SAS 5 Kinetic energy (KE) prevents molecules from sticking together: Gas: Liquid: Solid Energy IN (heating): Solid Liquid Gas
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lecture20_chem110_sas - Chapter 11: Intermolecular Forces...

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