Chapter%2012-3

Chapter 12-3 - Relating Properties to IM Forces 12.4-12.6 13.1 12.4 Liquids Consider a liquid Surface Interior A molecule on the interior can

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Relating Properties to IM Forces 12.4-12.6, 13.1
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12.4 Liquids Consider a liquid: A molecule on the interior can experience more intermolecular forces than a molecule on the surface Thus molecules in the interior are more stable The number of molecules on the surface is minimized Surface Tension Interior Surface
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12.4 Surface Tension Surface tension describes a liquid’s tendency to minimize the surface area Stronger intermolecular forces  Larger value for surface tension Order the following liquids in terms of increasing surface tension: H2O, CH3Br, I2
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Capillarity Glass Tube Simplified Water Molecules Cohesive forces between water molecules (Hydrogen bonds) Adhesive forces between water molecules and Glass wall (Hydrogen bonds) Adhesive stronger than cohesive leads to the meniscus, which maximizes the number of stronger adhesive forces Cohesive forces are identical to surface tension
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Viscosity: resistance to flow Flow requires breaking intermolecular forces (see below) Stronger intermol forces, higher viscosity Raising temperature reduces viscosity, why? Flow
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This note was uploaded on 11/29/2011 for the course CHEM 1212 taught by Professor Dockery during the Fall '08 term at Kennesaw.

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Chapter 12-3 - Relating Properties to IM Forces 12.4-12.6 13.1 12.4 Liquids Consider a liquid Surface Interior A molecule on the interior can

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