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105 F11 Lecture 27 cmpd

105 F11 Lecture 27 cmpd - Ion-dipole How do spiders walk on...

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Intra molecular forces Ionic Bonding Covalent Bonding Metallic Bonding
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Comparison of Forces Intra molecular Attractions between atoms Strong Determine geometry I n t e r m o l e c u l a r A
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Inter molecular forces Dipole-dipole Attraction between polar molecules ex. Cl-F, H-Cl, O-H, Hydrogen bonding A special case of dipole- dipole interactions involving H and N, O, or F.. Small and highly polar molecules - + - + - + - + - + - + - + - + - + - + - +
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DNA
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Why is a water droplet round? Surface tension
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How does a water strider stay on top of the water? Water strider Gerris remigis
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So why does salt dissolve then? The interactions between dipoles and ions must be stronger than dipole-dipole and
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Unformatted text preview: Ion-dipole How do spiders walk on walls? Spider foot showing scopula Spider “end feet” Inter molecular forces • London dispersion – Results from uneven electron distributions – Weaker than dipole interactions – Occurs to some extent for ALL atoms and molecules. Polarizability Real gases 20 40 60 80 100 120 140 160 Methanol Ethanol 2-propanol 1-propanol H2O Butanol Pentanol Explain this b.p. trend Scorpion telson and venom • Cohesive forces hold the crystalline solid together. • Adhesive forces hold the crystal to the telson. More bars in more places...
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