lec8_whc - Exam Jan. 29; Room Assignments Room 1051 SLB...

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Exam Jan. 29; Room Assignments ALL OTHER SECTIONS ( B01, B03, B05, B08, B10, B11, B13, B18, B19, BR0 ) Meet in Sciences Lecture Hall Edna B06 2076 SLB Edna B02 2068 SLB James B15 2059 SLB James B09 2051 SLB Mateo B16 1076 SLB Mateo B12 1068 SLB Troy B20 1075 SLB Troy B04 1067 SLB Kelly B17 1059 SLB Kelly B07 1051 SLB TA Section Room
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ch. 13; Last Time • Solutions, concentration scales • Enthalpy of solution • Lattice Enthalpy • Hydration Enthalpy • Single Ion Enthalpy – careful
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Formation of Solutions, Like dissolves Like H a H b H c soln abc H = H + H What determines exothermic or endothermic? • Magnitude of H a , H b , and H c depend on intermolecular forces. • Compare interactions in pure solvent and solute: A A, B B with mixture A B RULE: Like dissolves like!
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Intermolecular Forces in Mixtures H soln 0 Ideal solution A B A A B B Forces are similar between all combinations of components. Non-ideal Solutions • e.g. Adhesive forces A B greater than cohesive forces A A and B B . H soln < 0 Chloroform Acetone Special case for H-bonding
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• OR: Adhesive forces A B are less than cohesive forces A A and B B. But can still occur! H soln > 0 • BUT, if H soln too positive Æ heterogeneous mixture (no solution) Acetone (58g/mol) Carbon disulfide (76 g/mol) Like, oil and water.
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This note was uploaded on 06/13/2010 for the course CHEM 995940767 taught by Professor Topadakis during the Spring '10 term at UC Davis.

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lec8_whc - Exam Jan. 29; Room Assignments Room 1051 SLB...

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