Handout1001 - Lecture outline for Monday, October 1, 2007...

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Unformatted text preview: Lecture outline for Monday, October 1, 2007 (Chem 100, section 2) Topic: Energy of phases transitions and temperature changes Start with Review of Energy/Enthalpy Concepts Tabulated heats of reactions Exothermic: system heats surroundings Endothermic: surroundings heat system H rxn E rxn (P V n gas RT is small) H rxn and E rxn are mostly due to bond breaking and formation Forming bonds releases energy (to surroundings) so exothermic H rxn and E rxn depend slightly on T, P Energetics of Phase Changes H fus = H rxn for X(s) X(l) H vap = H rxn for X(l) X( g ) (measures average intermolecular force (total, per molecule)) Generally 0 < H fus < H vap Intermolecular forces determine H fus , H vap , T m and T b Specific and Molar Heat Capacity c, and C (c s and C m ) Calorimetry Constant V: Consant P: Coffee cup calorimetry Imagine two step process for exothermic rxn....
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This note was uploaded on 04/07/2008 for the course CHEM 100 taught by Professor Scarrow during the Fall '07 term at Haverford.

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