9-30-08[lecture9]mo - Chem notes 9.30.08 Lecture 9 (mo)...

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Lecture 9 (mo) Complicated Explanations Dispersion forces of HCl > HF Dipole-dipole forces of HF > HCl Boiling point HF > HCl because hydrogen bond of HF is strongest *Dipole – Dipole moment matters most in small molecules *Dispersion Forces matter most in large molecules Solid to Liquid = Molecules must overcome forces just a little bit Liquid to Gas = Molecules must completely overcome forces of attraction and escape In Diagram: CH 4 through SnH 4 line – As molecule gets bigger, dispersion forces get greater, it takes more energy to break the forces Mixed Intermolecular Forces 3 kinds of attractions when an ion is dissolved in water 1. Water – water Dipoles will align 2. Ion - ion Ions will attract cation to anion and vice versa 3. Ion - dipole A specific orientation of dipoles will form around the ion (depending on whether it’s a + or - ion 4. Dipole – induced dipole Dipole causes momentary dipole in non-polar molecule This is why it is possible for non-polar molecules to dissolve in polar molecules What is a solution? *Solution = mixture *Dispersion and uniformity involve entropy *Substance – Chemical that can’t be broken down without a chemical reaction Which is which? And how can you tell the difference between them?
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This note was uploaded on 12/02/2011 for the course PHYSICS 235 taught by Professor Staff during the Fall '08 term at Rutgers.

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9-30-08[lecture9]mo - Chem notes 9.30.08 Lecture 9 (mo)...

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