Lec10 Climate II - Global Climate Change II Chapter 3:...

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Global Climate Change II Chapter 3: Chemistry in Context
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How does the increase in CO 2 affect the Earth’s energy balance?
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How much IR radiation is captured by the atmosphere and radiated back toward the surface?
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Lewis Dot Structure Gives the electron configuration of an atom or molecule Electron configuration explains: Structure of a molecule (bonds) Reactivity with other atoms/molecules Interaction with light Shape of a molecule
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Molecular Shape Vibration Vibration depends on shape (arrangement of atoms) Interaction with IR radiation depends on vibrations
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Diatomic molecules vibrate only one way: bond stretch A B N 2 , O 2 , CO
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Polyatomic molecules vibrate according to shape Shape is determined by the number of atoms around each central atom The atoms adopt a shape that places them as far away from each other as possible. Two atoms Three atoms Four atoms A–B–A Linear 180 o B A A A Triangular 120 o B A A A A Tetrahedral 109 o
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Carbon Dioxide The number of atoms is the determining factor, not the type of bond (single, double, triple).
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Methane, CH 4
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CFC-11, CCl 3 F
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Ammonia, NH 3 An unshared pair of electrons counts as a (large) atom when determining shape.
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Water, H 2 O
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Ozone, O 3 The bond angle is larger than CH 4 , H 2 O, etc. because
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This note was uploaded on 10/24/2011 for the course CHEM 100 taught by Professor Vanleer,m during the Spring '08 term at University of Delaware.

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Lec10 Climate II - Global Climate Change II Chapter 3:...

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