7 - Intermolecular Forces

7 - Intermolecular Forces - Intermolecular Forces Love...

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Unformatted text preview: Intermolecular Forces Love & Hate in the Molecular Realm If I put 2 molecules into a sealed flask, what could happen? 1. They ignore each other. 2. They LOVE each other theyre attracted to each other 3. They HATE each other they repel each other If they LOVE each other, what would that look like? Initially Later If they HATE each other, what would that look like? Initially Later If they IGNORE each other, what would that look like? Initially Later What determines LOVE or HATE? The structure of the molecule. What is the structure of a molecule? H Br e- Whats in the nuclei? Protons! Molecular structure is all about POSITIVE & NEGATIVE CHARGES! So Love & Hate is all about Opposites attract, like repel! Types of Intermolecular Forces 1. London Dispersion forces, aka Van der Waals forces, aka Instantaneous dipole-induced dipole forces. 2. Dipole-Dipole interactions: either permanent or temporary 3. Hydrogen bonding particularly strong case of dipole-dipole interaction London Dispersion forces, aka Van der Waals forces, aka Instantaneous dipole-induced dipole forces. This is NOT the strongest, but it is the primary intermolecular force. All atoms or molecules with electrons have Van der Waals forces so ALL atoms or molecules have Van der Waals forces Instantaneous dipole-induced dipole forces Br Br Br Br The electron cloud is mobile. Charge density is constantly moving around  -  +  -  + Instantaneous dipole Induced dipole How Great is THAT!?!?!?...
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This note was uploaded on 04/17/2008 for the course CHEM 1011.216.0 taught by Professor Joelanzafame during the Winter '07 term at RIT.

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7 - Intermolecular Forces - Intermolecular Forces Love...

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