Lecture 33 Interactions involving polar & non-polar molecules

Lecture 33 Interactions involving polar & non-polar molecules

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Lec-33: Interactions involving polar & non-polar molecules Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 1 Intermolecular Forces H 2 O ` Ion-ion interactions ` Ion-dipole interactions ` Dipole-dipole interactions Hydrogen bonds ` Dispersion forces (London forces) ` Dipole-induced dipole interactions Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 2
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Ion-Ion Interactions Coulomb’s Law charges of the two ions E (Q 1 Q 2 ) E d Separation distance Provides intuition for relative energies of interaction Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 3 Ion-Ion Interactions Coulomb’s Law charges of the two ions E (Q 1 Q 2 ) E d Separation distance Provides intuition for relative energies of interaction Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 4
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Predicting Interaction Strength (Q 1 Q 2 ) Coulomb’s Law E d An increases in the charges of ions will ` An increases in the charges of ions will cause an increase in the force of attraction between a cation and an anion. ` An Increase in the distance between ions will decrease the force of attraction will decrease the force of attraction between them. Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 5 Predicting Interaction Strength Trends for ionic size Charge usually dominates Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 6
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CaO> NaF>CaF (Q Q ) A. CaO> NaF> CaF 2 B. CaF 2 >CaO> NaF, C. NaF >CaF 2 >CaO E 1 2 d Ca +2 2 D. CaO>CaF 2 >NaF O -2 Na + F - 7 Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 Predicting Interaction Strength Trends for ionic size Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 8
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This note was uploaded on 06/04/2011 for the course CHE 131 taught by Professor Kerber during the Spring '08 term at SUNY Stony Brook.

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Lecture 33 Interactions involving polar & non-polar molecules

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