12_chapt11 - Chapter 11 part 2 Properties of Liquids...

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Mary J. Bojan Chem 110 Chapter 11 part 2 Properties of Liquids Viscosity Surface Tension Capillary Action Phase Changes (energy of phase changes) Dynamic Equilibrium Vapor pressure Phase diagram 1
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Mary J. Bojan Chem 110 Structure Affects Function Functional Group Boiling point Structure Hydrocarbon MW = 72amu 36 ° C CH 3 CH 2 CH 2 CH 2 ί CH 3 Aldehyde MW = 72amu 75 ° C Ketone MW = 72amu 79 ° C amine MW = 73amu 78 ° C CH 3 CH 2 CH 2 CH 2 ί NH 2 ether MW = 74amu 34 ° C CH 3 CH 2 ί O ί CH 2 CH 3 Alcohol MW = 74amu 117 ° C CH 3 CH 2 CH 2 CH 2 ί OH carboxylic acid MW = 74amu 141 ° C CH 2 C O CH 3 CH 3 2 CH 2 C O H CH 2 CH 3 CH 2 C O OH CH 3
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Kinetic Molecular Description of Liquids and Solids gas: Kinetic energy >> intermolecular forces Liquid: Kinetic energy intermolecular forces Solid: Kinetic energy << intermolecular forces 3 Kinetic Energy T Heating: T , KE solid liquid gas Mary J. Bojan Chem 110
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Mary J. Bojan Chem 110 Properties of Liquids 4 Intermolecular forces play an important role in the properties of liquids Cohesive Forces: forces within liquid Adhesive forces: forces between the liquid and a surface. There is a “competition”.
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Chem 110 Properties of Liquids Viscosity : resistance to flow cohesive forces , viscosity For pure compound: as T viscosity 5 Motor oil: SAE 10 has lower viscosity than SAE 40
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12_chapt11 - Chapter 11 part 2 Properties of Liquids...

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