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Lecture-13 - Chem111 Fall 2005 Lecture 13 Bonding and...

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Chem111 Fall, 2005 51 Enough of atoms! Let's see how they form molecules … Consider the molecules CO 2 and H 2 O O C O O H H linear bent non-polar quite polar gas at room temp. liquid at RT two double bonds two single bonds We could use the Schrödinger equation , approximations, lots of complicated mathematics, and a computer program and solve for the structures of our molecules. Æ too expensive (both $$ and time) / Æ we will come up with "rough" methods, based upon concepts Organization of this part of the course What are bonds? (Ionic bonds, covalent bonds, in-between) Brief review of Lewis dot structures – electron bookkeeping How can we predict (accurately) the shapes of molecules? (VESPR) What does quantum mechanics tell us about bonding? (Molecular Orbitals) Lecture 13: Bonding and Molecules Ionic and Covalent bonds Electronegativity Lewis Dot Structures VESPRR (I)
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