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

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