Forces October 1st - Cohesive forces bind molecules of the...

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Intermolecular Forces: Why condensed phases exist Chemical bonds o Strong o Directional o Short Range (relative) Intermolecular Forces o Weaker than chemical bonds, usually much weaker o Less directional than covalent bonds, more directional than ionic bonds o Longer range than covalent bonds but at shorter range than ionic bonds Types of Non-Bonded (Intermolecular) Attractions 1. Dipole-dipole interactions = hydrogen bonding 2. Ion-dipole interactions 3. Induced dipole attractions 4. London dispersive forces Characteristics of the Liquid State Low compressibility High density, relative to gases Surface tension Exhibit capillary action o Cohesive forces o Adhesive forces Viscosity Forces on atoms on a surface vs. in the bulk
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Unformatted text preview: Cohesive forces bind molecules of the same type together Adhesive forces bind a substance to a surface-A molecule in the interior of a liquid is attracted to the molecules surrounding it, whereas a molecule at the surface of liquid is attracted only by molecules below it and on each side of it. An Introduction to Structures and Types of Solids 1. Crystalline Solids a. Highly regular arrangement b. “Lattice”: 3D arrangement, with unit cell structures i. Simple cubic (Po metal) ii. Body-centered cubic (U metal) iii. Face-centered cubic (Au metal) 2. Amorphous Solids a. Disordered Structures...
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