StudentLecture_17

StudentLecture_17 - Lecture 17 10/27/2009 Lab: Wheres the...

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Lecture 17 10/27/2009 Lab: Where’s the Iron, CH 7, an opportunity to apply your knowledge of spectrophotometry Reading in RA – LO on Blackboard HW as usual WRR 11:00 Wednesday office hour cancelled this week
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IMFs combine in many liquids and solids Also called dispersion force 2 Energies associated with IMFs
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Formation of Solutions Ethanol with water. Ethanol: Shake
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Formation of Solutions Ethanol with water: water increases and change in regance (exothermic dissolution), both H 2 O and ethanol form hydrogen bonds
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Formation of Solutions Break H-bonds & dispersion forces in H 2 O Break dispersion forces & H-bonds in ethanol Make equivalent H-bonds & dispersion forces in the solution
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Formation of Solutions Shake What will happen if we add dichloromethane to water?
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Formation of Solutions Dichloromethane with water: Disorder increases, but change in energy is unfavorable (Break strong H ····O make weak Cl ····H, etc.)
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Formation of Solutions “Like dissolves like.” Here we mean solvents & solutes with same charge dissolve in one another
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Question #1 Solutions of Solids Solid I_2_ is most soluble in: A. Dichloromethane B. Water Demo
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Question #2 Solutions of Solids KMnO_4_ is most soluble in: A. Dichloromethane B. Water Demo
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StudentLecture_17 - Lecture 17 10/27/2009 Lab: Wheres the...

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