Lecture4 - Physical Constants and Observable...

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Unformatted text preview: Physical Constants and Observable Characteristics Can Help Identify an Unknown Liquid by Narrowing the Field Visual Cues: Color, clarity, viscosity. Smell: Do not do this unless instructed to, however, it is often unavoidable. Taste: Never do this intentionally! Miscibility: For example, in water. Density: Qualitative, for example, relative to water or quantitative (weight of a given volume). Boiling point In the next experiment you will collect the following data for two unknown liquids and use this information to deduce the identity of these compounds. 1. Dipole moment (qualitative) 2. Miscibility with water 3. Density relative to water 4. Boiling point Dipole Moments: Bond Dipoles and Molecular Dipoles Bond dipoles arise from differences in electronegativities of the atoms forming the bonds. For diatomic molecules the Bond Dipole = Molecular Dipole Dipole moment = size of charge separation of charge (coulomb meters) 1 Debye = 3.34 10-30 Cm H Cl Br Cl A Molecular Dipole Moment (m...
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This note was uploaded on 10/25/2009 for the course CHEM 3AL taught by Professor Li during the Spring '08 term at University of California, Berkeley.

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Lecture4 - Physical Constants and Observable...

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