12_chapt11 - Remember Chapter 11 part 1 Introduction to...

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Mary J. Bojan Chem 110 Remember Chapter 11 part 1 Introduction to Kinetic Molecular Theory and Intermolecular forces 1
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To understand properties, we want to connect what we see to what is happening on a molecular level. Start with states of matter: gas à liquid à solid. 2 Mary J. Bojan Chem 110 Kinetic Molecular Theory is used to explain what is happening on a molecular level. Key postulate of this theory is that molecules have kinetic energy : they are in constant motion in all states.
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States of Matter 3 The state a substance is in at a particular temperature and pressure depends on two antagonistic entities: The kinetic energy of the particles The strength of the attractions between the particles Mary J. Bojan Chem 110
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If we know the relative strengths of these two interactions we could predict the state of a substance. gas: Kinetic energy >> intermolecular forces Liquid: Kinetic energy intermolecular forces Solid: Kinetic energy << intermolecular forces 4 Kinetic Energy T Heating: T , KE solid liquid gas Mary J. Bojan Chem 110
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Mary J. Bojan Chem 110 IM Forces: 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 5 CH 2 C O H CH 2 CH 3 CH 2 C O OH CH 3
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Chem 110 Chapter 11 part 2 Properties of Liquids Viscosity Surface Tension
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This note was uploaded on 01/18/2012 for the course CHEM 110 taught by Professor Hofmann,brucerob during the Fall '08 term at Pennsylvania State University, University Park.

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12_chapt11 - Remember Chapter 11 part 1 Introduction to...

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