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Lecture 1 - Equations of state(Chapter 16.1 16.2 Ideal and...

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Lecture 1 1 Equations of state (Chapter 16.1, 16.2) Ideal and Non-Ideal Gases Chem 442: What did you learn (I hope!) Microscopic Properties of Matter Quantum phenomena Energy levels: atoms, diatomics, polyatomics Electronic, Vibrational, Rotational Degrees of Freedom Interaction between radiation and matter Chem 444: What will you learn (I hope!) Will learn how to connect knowledge between microscopic world (atomic/molecular level) with macroscopic (bulk) phenomena
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Lecture 1 2 Where do we start? Gases! Simplest bulk material. Why? Minimal intermolecular interactions. 23 3 o 3 3 27 Consider: At 1 atm, 1 mol (6.02 10 molecules) occupies ~ 22.4L = 22.4 10 =22.4 10 A cm × × × 2 Why ? 3 o 3 Therefore: Each molecule occupies a volume of ~ 37 10 A × o (That's a cube with length ~ 33A) o Chemical bonds ~ 1-2A there is a good distance between weak interactions 3 o 3 24 2 Contrast: liquid H O 1 mole occupies ~ 20cm =20 10 A × o (That's a cube with length ~ 3.2A) 3 o Each molecule occupies a volume of ~ 33A Liquids live in much closer quarters!
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