notes_162_Exp_3_Notes_040908

notes_162_Exp_3_Notes_040908 - EXPERIMENT 3 INTERMOLECULAR...

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EXPERIMENT 3: INTERMOLECULAR FORCES Part I. Properties, Intra- and Inter- Molecular Forces and Structure of Maleic and Fumaric acids Part II. Vapor Pressure of Liquids and Enthalpy of Vaporization Consult Zumdahl sections 16.1 and 16.10 for help.
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PRELAB 1) Complete WebAssign prelab. 2) Please print the Part I Report Sheet from the Chem. 162 lab web site and bring this to the lab. You will hand in these pages to your TA at the end of the lab. 3) Review the relationship between intermolecular forces, vapor pressure and enthalpy of vaporization. Review the ideal gas law. 4) Enter Purpose and Method in your lab notebook.
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Purpose Part I Understand the effect of intermolecular forces on melting points, solubility, and acid dissociation constants. Part II Measure the enthalpy of vaporization of four organic compounds and describe the intermolecular bonding energy in terms of the dispersion and polar components.
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Special Note about Part I: You can talk with any of your fellow students about the work. The TA is not allowed to answer any questions about this part during the lab. You will submit your work (Part I only) at the end of lab. Your TA may answer questions about this section only after ALL 162 sections have done the lab (that means the following week). This part will stretch your thinking and, by the end of the lab period, you will probably feel like you have learned more from this lab than others. Half of the lab points belong to this part, so do your best work and prepare well before heading into lab.
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Intramolecular forces Æ forces within molecules; atoms sharing electrons Intermolecular forces Æ forces between molecules; interactions are weaker than covalent or ionic bonding; involved in the aggregation of components of a substance to form a liquid or solid Changes of state Æ forces between molecules change but those within do not (individual molecules stay intact) Types of Intermolecular forces: Dipole-dipole (polar) Hydrogen bonding London dispersion Some Definitions and Review
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This note was uploaded on 05/08/2008 for the course CHEM 162 taught by Professor N. during the Spring '08 term at University of Washington.

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notes_162_Exp_3_Notes_040908 - EXPERIMENT 3 INTERMOLECULAR...

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