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VSPER

1211 lab strc 409
by

Aimee Tomlinson

on 18 August 2011

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Transcript of VSPER

Examples Oxygen difluoride, OF 2 hydronium ion, H O 3 + 2 hyrogen peroxide, H O formaldehyde, CH O 2 2 carbon dioxide, CO 3 Ozone, O 5 phosphorous pentachloride, PCl 2 3 Triiodide, I _ VSEPR Theory linear, AB molecular & electronic geometries 3D arrangement of species about a central atom electronic geometry includes all species attached to central atom only considers atoms attached to central atom molecular geometry types of geometries A = central atom
B = terminal atom
N = lone pair of electrons 2 electronic & molecular geometries for AB or AB 2 trigonal planar, AB 3 same for both electronic & molecular geometries Bent 120, AB N 2 electronic geometry: trigonal planar
molecular geometry: bent tetrahedral, AB 4 all angles are 109.5 all angles are 120 <BAB < 120 due to lp repulsion electronic & molecular geometries are the same trigonal pyramidal, AB N 3 <BAB < 109.5 due to lp repulsion electronic geometry: tetrahedral
molecular geometry: trigonal pyramidal Bent 109, AB N 2 2 electronic geometry: tetrahedral
molecular geometry: bent <BAB < 109.5 due to lp repulsion Trigonal Bipyramidal, AB 5 electronic & molecular geometries are trigonal pyramidal <B AB = 90 & < B AB = 120 e e e a a Seesaw, AB N 4 electronic geometry is trigonal pyramidal
molecular geometry is seesaw e e B AB < 90 & < B AB < 120 e e e electronic geometry is trigonal pyramidal
molecular geometry is T-shaped a B AB < 90 & < B AB < 180 3 a T-shaped, AB N 2 a a e Linear, AB N B AB < 90 & < B AB < 180 3 2 e electronic geometry is trigonal pyramidal
molecular geometry is linear Octahedral, AB 6 electronic & molecular geometries are octahedral all angles are 90 Square Pyramidal, AB N 5 all <BAB < 90 due to lp repulsion electronic geometry is octahedral
molecular geometry is square pyramidal Square Planar, AB N 4 2 all <BAB angles are 90 electronic geometry is octahedral
molecular geometry is square planar use the Lewis Structure to identify the electronic geometry 4 items connected to central atom - tetrahedral geometry - trigonal planar - B
- tetrahedral - C
- trigonal bipyramidal - P
- octahedral - S go back to element icon
select correct atom
change the fragment type to
atom at bottom of window
return to builder window
click on the atom you want to change click on delete atom icon
user cursor and click on atom
you want gone click on bond icon
click on the two bondied atoms
select correct bond from popup window Gaussian Instructions Building a MOlecule changing elements deleting atoms changing bond types Double click icon on Destop
Click on element icon in upper left
select the element whose VE number best fits the electronic geometry Lewis Structure - 4 items on central O 4 items connected to central O-atoms Number of items around C-atom is 3 2 items connected to central C-atom 3 items connected to central O-atom number of items is 5 connected to P-atom I-atom connected to 5 items Bent 109 for molecular geometry trigonal pyramidal molecular geometry trigonal planar molecular geometry linear molecular geometry bent 120 molecular geometry trigonal bipyramidal molecular geometry linear molecular geometry Click in builder window & molecule appears bent 109 molecular geometry
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