Week 02 - Ge ral Che istry ne m C HEM 151 Week 2 UA GenChem...

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UA GenChem General Chemistry General Chemistry CHEM 151 CHEM 151 Week 2
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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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UA GenChem A Particulate Model of Matter Basic Assumptions: 2. Particles are constantly moving (translation, rotation, vibration); How do we explain pressure ” in microscopic terms?
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UA GenChem BROWNIAN MOTION Pollen in oil under A microscope
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UA GenChem Let’s look at a particle simulator Google “Ideal Gas Simulator” pick the one from OK State. http://www.chem.arizona.edu/chemdem/gaslaw Discovery Activity
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UA GenChem Look at the speed of the particles What do you notice about the SPEED of the particles?
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UA GenChem Speed of ONE particle What do you notice about the SPEED of a single particle?
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UA GenChem Particle Collisions What happens when two particles COLLIDE ?
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UA GenChem Collisions with the Wall What happens a particle COLLIDES with the wall of the container?
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UA GenChem The Red Box What does the RED BOX on the right indicate?
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UA GenChem The graph on the right What do the GREEN BARS on the right tell us?
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UA GenChem The Vertical Line on the Graph What does the VERTICAL LINE on the graph represent?
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UA GenChem The smooth line on the graph What does the SMOOTH LINE on the graph represent?
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UA GenChem Shape of the smooth line What does the SHAPE of the smooth line represent?
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UA GenChem
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GenChem Adding Particles What will happen to the speeds if we ADD more particles? (do it first)
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Week 02 - Ge ral Che istry ne m C HEM 151 Week 2 UA GenChem...

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