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Lewis Structure + Molecular shapes |
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| Apr13-05, 11:33 PM | #1 |
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Lewis Structure + Molecular shapes
3. Which of the following is the molecular shape of the ion, ICl4-?
A. Tetrahedral B. See saw C. Square planar D. Square pyramidal E. Trigonal pyramidal I drew the lewis structure, 4 chlorines bound to an Iodine. Iodine has 7, Each clorine has 7 with 35 total, the bonds account for 4, so distributing the rest of the 31 electrons, I put 6 on each chloride, and 6 on the iodine, with the extra electron floating since its a negative ion. This is kinda bugging me since Iodine has 8 electrons from the bonds alone, and now the extra electrons put it up to 14. I must have drawn it wrong, but anyway: Molecular shape is decided by electron domains, and since we have 4 from bonds and 3 from electron pairs, 7 total. Thats way too many, we only went up to 6 electron domains in class, and thats for a square planar. Help? My test is next week. |
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| Apr14-05, 12:06 AM | #2 |
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It can't be square planar.It's a square pyramid.I hope u see why.
Daniel. |
| Apr14-05, 12:23 AM | #3 |
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In all honesty I cant relate the names to the geometries.
I know the seesaw one is a vertical (z) axis, and on the xy plane, 3 branches 120 degrees apart. I believe square planar is shaped like an x,y,z axis is set up. Do you know if I did my lewis structure right? |
| Apr14-05, 12:36 AM | #4 |
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Lewis Structure + Molecular shapes
Also the answer sheet says its square planar.
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| Apr14-05, 12:37 AM | #5 |
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Yes,one electron does provide the mesomerical (Pauling) structures...But it's okay.Just the geometry that u found was incorrect.Maybe u'll learn about Gillespie's models,too.
Daniel. |
| Apr14-05, 12:43 AM | #6 |
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I have no idea of what what you jsut said means.
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| Apr14-05, 12:54 AM | #7 |
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I'm sorry,you're right.The hybridization is not [itex] \mbox{sp}^{3} [/itex],so it's not a pyramid (somewhat similar to methane).The "d" orbitals of Iodine participate,too.I think it's [itex] \text{sp}^{2}\text{d} [/itex] who's got a planar structure.
Daniel. |
| Apr14-05, 07:24 AM | #8 |
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The hybridization is [itex]sp^3d^2[/itex]. The structure is square planar. There will be two non-bonding pairs oriented normal to the plane (along +z and -z).
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| Apr14-05, 07:31 AM | #9 |
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| Apr14-05, 10:31 AM | #10 |
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1.I screwed it up real badly. 2.The structure should be octaedrical.But it's square planar,because of the 2 nonbonding pairs which don't count.Reminds me of water molecule with 2 non bonding pairs. Daniel. |
| Apr14-05, 11:55 AM | #11 |
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The electron geometry would be the x-y-z looking one, octahedral? |
| Apr14-05, 12:29 PM | #12 |
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Yes,it should be octaedrical,typical for [itex] \mbox{sp}^{3}\mbox{d}^{2} [/itex] hybridization.
Daniel. |
| Apr14-05, 04:16 PM | #13 |
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| Apr14-05, 06:08 PM | #14 |
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xyz looking one means the structure where it lokos like the xyz axes on a graph. I believe we are talking about the same one, octahedral. I just need to look over the names of the geometries.
Thanks to both of you. |
| Apr15-05, 12:07 AM | #15 |
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It would be [c] because looking at I itself, it has 2 lone pair (4 valence electrons; don't forget the -ve charge on the molecule) and 4 arms sticking out to hold the Cl atoms to it.
Don't panic, try to visualise it this way....a piece of square cardboard with the I atom in the middle, 4 Cl atoms at the corners, and then you have 2 big lobes (2 lone paris) sticking out from the top and bottom of the cardboard. Hope this helps!
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| Apr15-05, 12:19 AM | #16 |
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Some additional notes to help you prepare (try to memorise them!)
Bonding domains (BD) - bonded to another atom Non-bonding domains (NBD) - signify lone pairs [2 pairs] Linear - 2 BD, 0 NBD e.g. CO2 [3 pairs] incld lone pairs Trigonal planar - 3 BD, 0 NBD Bent - 2 BD, 1 NBD [4 pairs] incld lone pairs Tetrahedral - 4 BD, 0 NBD Trigonal pyramidal - 3 BD, 1 NBD Bent (tetrahedral) - 2 BD, 2 NBD e.g. H20 [5 pairs] incld lone pairs Trigonal bipyrimidal - 5 BD, 0 NBD Seesaw - 4 BD, 1 NBD T-shaped - 3 BD, 2 NBD Linear (trigonal bipyramidal) - 2 BD, 3 NBD *this one has 3 lobes (3 lone pairs) surrounding the central atom on a plane and 2 atom attached to it from the top and bottom.* [6 pairs] incld lone pairs Octahedral - 6 BD, 0 NBD Square pyrimidal - 5 BD, 1 NBD Square planar - 4 BD, 2 NBD |
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