c103-sp10-0405

c103-sp10-0405 - Chemistry 103 Spring 2010 Today 1. Factors...

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Chemistry 103 Spring 2010 Today 1. Factors affecting solubility. 2. Colligative properties. Announcements 1. OWL homework for Ch. 14 due next week. 2. DROP deadline on Apr. 6, Tuesday. 3. ADD deadline on Apr. 12, Monday. 4. First midterm exam on Apr. 19 or 21. 5. CSULA closure on May 21 (furlough). 6. CSULA closure on May 31 (holiday). 7. Bring textbook and calculator to each lecture.
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Chemistry 103 Spring 2010 2 Factors affecting solubility Substances can mix to form solutions. The solubility of one substance in another substance depends on intermolecular forces (IMF’s). Solutions have three categories of interactions: 1) solvent-solvent IMF’s, 2) solute-solute IMF’s, and 3) solute-solvent IMF’s. Example : methanol CH 3 OH dissolving in water
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3 The relative strengths of these various IMF’s determine the overall enthalpy change (energy change) when the substances mix. Fig. 14.4. a) solvent-solvent IMF’s => Δ H ° solvent b) solute-solute IMF’s => Δ H ° solute c) solute-solvent IMF’s => Δ H ° solute-solvent Δ H ° solution = Δ H ° a + Δ H ° b + Δ H ° c = Δ H ° soln Δ H < 0 means … Δ H > 0 means … Another important factor in forming solutions is the entropy change ( Δ S) when the substances mix. entropy
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c103-sp10-0405 - Chemistry 103 Spring 2010 Today 1. Factors...

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