LECTURE8 - Midterm 1 Monday Apr 18th In class....

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1 Midterm 1 Monday Apr 18 th In class. Thermochemistry (chap 11) Liquids and Solids (chap 12) Solutions (chap 13) Sample exams on website – guide only Be early. Bring your student ID!! Bring your calculator (clear programmable ones) ! Closed book Formation of Solutions Δ H a Δ H b Δ H c soln abc Δ H = Δ H + Δ Δ H • Magnitude of Δ H a , Δ H b , and Δ H c depend on intermolecular forces. • Compare interactions in pure solvent and solute: A A, B B with mixture A B
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2 Intermolecular Forces in Mixtures Δ 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 can be greater than cohesive forces A A and B B . Δ H soln < 0 Chloroform Acetone • OR: Adhesive forces A B are less than cohesive forces A A and B B. Δ H soln > 0 • BUT, if Δ H soln too positive heterogeneous mixture (no solution) Acetone (58g/mol) Carbon disulfide (76 g/mol) e.g. How miscible are alcohols in water?
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This note was uploaded on 07/09/2011 for the course CHE 2B 2B taught by Professor Tobyallen during the Spring '11 term at UC Davis.

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LECTURE8 - Midterm 1 Monday Apr 18th In class....

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