19 - CHM 11500 Lecture 19 Colligative Properties Reading:...

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1 CHM 11500 Lecture 19 Colligative Properties Reading: pp. 672-686
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2 This Week in Chemistry Attend lecture, lab, recitation Lab, Preparation of Luminol Very Fun! Homework due Sunday 11/13/11 at 11:59 PM.
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3 Lab: Preparation of Luminol multi-step organic synthesis Luminol
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4 Chemiluminescence Prelab: What are examples of chemiluminescence in nature? (besides fireflies and glowworms)
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5 Exam 3 Elliot Hall of Music, 6:30 PM, Monday Nov. 14 Be there by 6:10 PM Bring PUID, pencils, non-programmable calculator, and seat location . The exam covers Lectures 15-20, Connect homework, learning objectives for those lectures, labs (Spectrophotometric Analysis and Where’s the Iron)
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6 Colligative Properties Solutions homogeneous, mixed at the atomic/molecular scale Solubility (g of solute / mL of solvent) Affected/determined by IMF’s Phases All combinations of sol/liq/gas. (Ex. gas-liq, liq-liq solutions) Energy Considerations Energy to separate components, energy from mixing, entropy Colligative Properties Solution properties DIFFERENT than properties of the individual components. Examples: bp, fp, vp, osmotic pressure
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7 Colligative Properties Properties that are affected by the number of particles in the solution, regardless of type. Vapor Pressure Boiling Point Freezing Point Osmotic Pressure
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8 Question #1 In an aqueous solution (water), which substance is a non-electrolyte (forms no ions)? A.Hydrogen chloride (HCl) x B.Potassium nitrate (KNO 3 ) x C.Ethylene glycol (C 2 H 6 O 2 ) o D.Ammonia (NH 3 ) x
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9 Vapor Pressure Definition: The equilibrium pressure of a vapor above its liquid; The pressure of the vapor resulting from evaporation of a liquid above a sample of the liquid in a closed container.
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19 - CHM 11500 Lecture 19 Colligative Properties Reading:...

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