Chapter+12 - Chemistry Chapter 12 Intermolecular Forces:...

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Click to edit Master subtitle style 6/6/11 Chemistry Chapter 12 Intermolecular Forces: Liquids, Solids, and Phase Changes Dr. Shamindri M. Arachchige arachsm@vt.edu Davidson 11 11 Office Hours: Help Session Location: Davidson 11 Location: MCB 100 Monday 9:30-10:30 AM Monday 6:50-7:50 PM Tuesday 3:30-5:30 PM Wednesday 2:00-4:00 PM Other hours by appointment
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6/6/11 22 Chapter 12 Intermolecular Forces: Liquids, Solids, and Phase Changes Solids Liquids Gases Very ordered 3D array Doesn’t take shape or fill volume of container Vibrational motion only Relatively dense Almost noncompressible Attraction between particles Particles close together, but not ordered Takes shape, but doesn’t fill volume of container Particles can move past each other Relatively dense Low compressibility Attraction between particles Container is mostly empty space Gas takes shape and fills volume of container. Particles moving extremely fast in random motion Not dense Compressible Little or no attraction between particles Solids Liquids Gases
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6/6/11 33 Chapter 12 Intermolecular Forces: Liquids, Solids, and Phase Changes Chem ical properties of substances are determ ined by the strength of their intramolecular forces : Physical properties of substances are determ ined by the strength of the intermolecular forces : Boiling point is a good measure of intermolecular forces: B o i l
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44 Polarizability Chapter 12 Intermolecular Forces: Liquids, Solids, and Phase Changes distortion of an electron cloud Polarizability increases down a group size increases and the larger electron clouds are further from the nucleus Polarizability decreases left to right across a period increasing Z eff shrinks atomic size and holds the electrons more tightly Cations are less polarizable than their parent atom because they are smaller. Anions are more polarizable than their parent atom because they are
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Chapter+12 - Chemistry Chapter 12 Intermolecular Forces:...

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