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VSPER, imfs & Molecular Polarity
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February 14, 2020
Shapes for Carbon ‐ carbon has 0 lone pairs.
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trigonal planar or flat triangle
3 bp 0 lp
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Nitrogen Shape Options
trigonal pyramidal or tripod
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but could look linear....the atoms are in the same plane
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Oxygen Options
bent, but could look flat,bc the atoms are in the same plane
SULFUR HAS THE SAME OPTIONS AS OXYGEN
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Hydrogen Option
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Total IMF strength at this moment = +1+1+1+5+5+13+9+5+9+8+4‐12=49
If ammonia rotates, it could be higher. If the particles are allowed to move around each other in any random fashion it could be even higher!
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Intermolecular Forces ‐ van der Waal's Forces
These are the forces of attraction (and repulsion) between molecules. They play key roles in our cells. For example, the two strands of DNA are held together by hydrogen bonds. And our proteins take on their shape through intermolecular forces.
Intermolecular forces (imfs) are much weaker than intramolecular forces (covalent and ionic bonds). They are responsible for how substances interact with each other and for physical properties like melting point and boiling point, and even viscosity.
In order from weakest to strongest:
1. London dispersion forces (Ldf) 2. Dipole‐induced dipole (d‐id)
3. dipole‐dipole (d‐d) 4. Hydrogen bonding (H bond) 5. Ion‐dipole (i‐d)
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