Lect_W2_151-2 WESO (short)

Lect_W2_151-2 WESO (short) - General Chemistry CHEM 151...

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UA GenChem General Chemistry General Chemistry CHEM 151 CHEM 151 Week 2
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UA GenChem Week 2 Reading Assignment Week 2 Section 5.8 Kinetic Molecular theory : a Model for Gases 5.9 Mean Free Path Tools of Chemistry – equations and graphs for gases Section 5.1 pressure and Units 5.2 Pressure and Collisions 5.3 Simple gas laws –Charles, Boyle, Avogadro Work answered end-of-chapter problems as needed (YOU decided where you are and where you need to be.)
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UA GenChem Analysis What is this? Modeling How do I explain it? Synthesis How do I make it? Three central goals Why do substances undergo phase transitions with changing temperature or pressure? How do we MODEL these systems to Explain/Predict their behavior? Modeling Macroscopic Microscopic or Particulate Symbolic NaCl Three different perspectives
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UA GenChem Macro vs Micro Macroscopic Description We measure properties: Temperature ( T ) Pressure ( P ) Volume ( V ) Microscopic Description We model systems as composed by particles: Number ( N ) Mass ( m ) Speed ( v ) Kinetic Energy ( KE ) Potential Energy ( PE ) The challenge: Use microscopic descriptions to explain macroscopic behavior
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UA GenChem Solid Liquid Gas 1 mL of Water = 33444444444444444444444 molecules A Particulate Model of Matter Basic Assumptions : Particles could represent anything we want: atoms, molecules, ions. Note : These representations are static , have unrealistic proportions , represent particles as solid objects . 1. Any macroscopic sample of a substance is composed of a large number of particles ; Size~ 0.000000001 m = 1 x 10 -9 m = 1 nm (1 nanometer)
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GenChem A Particulate Model of Matter Basic Assumptions: 2. Particles are constantly moving (translation, rotation, vibration); How do we explain pressure ” in microscopic terms? Pressure
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This note was uploaded on 03/30/2009 for the course CHEM 151 taught by Professor Staff during the Spring '08 term at University of Arizona- Tucson.

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Lect_W2_151-2 WESO (short) - General Chemistry CHEM 151...

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