chem lecture 22

chem lecture 22 - General Analytical Chemistry II 1011-216...

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General & Analytical Chemistry II 1011-216 Winter 2008 Lecture 22
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General & Analytical Chemistry II Chap. 11: Intermolecular Forces • Covalent bonds hold molecules together. • Intermolecular forces hold molecules together in liquids and solids. • Intermolecular bonds are weak compared to covalent bonds
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General & Analytical Chemistry II Strength of Intermolecular Bonds • The strength of intermolecular bonds must be compared to available thermal energy. • The average kinetic energy is given by E kin = 1.5RT in J/mol
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General & Analytical Chemistry II Vaporization & Melting • Intermolecular bonds must be broken to go from liquid to gas - vaporization solid to liquid - melting solid to gas - sublimation • The normal boiling and melting points are temperatures at which vaporization and melting occur at P = 1 atm.
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General & Analytical Chemistry II Normal Boiling & Melting Points Weak intermolecular forces Strong metallic bonds
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General & Analytical Chemistry II Intermolecular Forces & Gases • Ideal Gas PV = nRT • Compressibility Factor = PV = Z nRT • Z = 1 ideal gas • Z < 1 molecules attract • Z > 1 molecules repel
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This note was uploaded on 03/18/2010 for the course COS 101121501 taught by Professor Langner during the Fall '08 term at RIT.

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chem lecture 22 - General Analytical Chemistry II 1011-216...

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