Chem 115 Lecture_18 - CHM 115 Lecture 18 Colligative...

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1 CHM 115 Lecture 18 Colligative Properties Reading: pp. 672-686
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2 As a solution freezes the solute may remain in the unfrozen solvent. This is the case with sea water, the salt stays in the unfrozen water. Where did explorers who walked to the North Pole get drinking water?
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3 Colligative Properties Solutions homogeneous, mixed at the atomic/molecular scale Solubility (moles of solute / L of solvent, etc) Affected/determined by IMF’s Phases All combinations of sol/liq/gas. (gas in liq, liq in liq, for example, no liquid/solid in gas) Energy Considerations Energy to separate components, energy from mixing, entropy Colligative Properties Solution properties DIFFERENT than properties of the individual components.
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4 Colligative Properties Properties that are affected by the number of solute particles (atoms, molecules or ions ) in the solution, regardless of type. Vapor Pressure Boiling Point Freezing Point Osmotic Pressure
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5 CPS Question #2 In an aqueous solution, which substance is a non-electrolyte:
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This note was uploaded on 04/07/2008 for the course CHEM 115 taught by Professor L during the Spring '02 term at Purdue University-West Lafayette.

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Chem 115 Lecture_18 - CHM 115 Lecture 18 Colligative...

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