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7 - Intermolecular Forces

7 - Intermolecular Forces - Intermolecular Forces Love Hate...

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    Intermolecular Forces Love & Hate in the Molecular Realm
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    If I put 2 molecules into a sealed flask,  what could happen? 1. They ignore each other. 2. They LOVE each other – they’re attracted to  each other 3. They HATE each other – they repel each other
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    If they LOVE each other, what would  that look like? Initially Later
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    If they HATE each other, what would  that look like? Initially Later
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    If they IGNORE each other, what  would that look like? Initially Later
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    What determines LOVE or HATE? The structure of the molecule. What is the structure of a molecule? H Br e- What’s in the nuclei? Protons!
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    Molecular structure is all about… POSITIVE & NEGATIVE CHARGES! So Love & Hate is all about… Opposites attract, like repel!
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    Types of Intermolecular Forces 1. London Dispersion forces, aka Van der Waal’s  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
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    London Dispersion forces, aka Van der  Waal’s 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 Waal’s forces – so ALL atoms or molecules  have Van der Waal’s forces
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    Instantaneous dipole-induced dipole  forces Br Br Br Br The electron cloud is  mobile. Charge density is  constantly moving  around - + - + Instantaneous dipole Induced dipole
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    How Great is THAT!?!?!?
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