Key-3 - Chemistry 30.102 Third Examination Spring 2011 K63...

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Unformatted text preview: Chemistry 30.102 Third Examination Spring 2011 K63 Name (Please Print Ciearly) la. (8 points) Co(III) forms octahedral complex ions. Draw the structures of the possible isomers of (Co+3)(NH3)4(Cl’)2 . Cl: 7/ a Nll N Hz NH} Cl 3\ C +3/ \\ 043/ NEE/l ‘\ N H3 N93 / \\ NH3 Cl- ~93 Trams st lb. (7 points) Give an example of a bidentate ligand. 0 CH2.“ 0442 PI Claw-c” / \ , / \ .— NH‘L NH}- 0 0 QXdll‘C. amal- emaleneohamme V am (Ed SCAG TWO 1‘5 Score: 2a. (7 points) Aluminum has the same number of valence electrons as boron. What kind of structure and bonding would you expect for AIZCI6 ? N2 @ Score: ‘ 5 _._.____ 3a. (10 points) Show how the two sp hybrid orbitals can be constructed from a 25 and the appropriate 2p atomic orbitals (mathematical equations). VS? ‘ fill: J" um (“‘33 “(Sp z ’les —- 71Lpr (5‘ F") 3b. (10 points) Indicate Via a drawing (i) the superimposed individual atomic orbitals and (ii) the shape of the hybrid orbital that results. (Do this separately for both of the two hybrid orbitals.) @ -———> @® @1719) . (5 PTS) @3 -———9 @6 Score: a O _.___ 4a. (7 points) Consider the linear molecule N—C—C—N (showing only What is connected to What, not the number of bonds). What type of hybrid orbitals would you expect on each atom? How many 0' and 7: bonds are there in the molecule (indicate Where)? What is the dipole moment? S'P 3? Sp .5? 0’ :NEC—CEN: t 3' 3): (arm) (ms) N"C"C”N 4b. (8 points) Carbon can exist in molecules with three distinctly different bonding geometries Give a simple example that illustrates each geometry. What kind of hybrid orbitals are used in each? (39 mail/mm 9 .ei’halene (3.3 aceiglemfi ‘f‘ejTA healmj \qmr +m6ami hww‘f $133 3P2 habfid$ ii A Hacg __H H/ ’C\ Li Score: I 5a. (10 pts) For carbon monoxide the order of the MO's is, (323, 625*, 21:, 0’21) , 27:*, 0213*. Give the MO picture of the bonding in this molecule; would CO' be more stable than CO? CO+? 5b. ( 10 points) Using the language of hybrid orbitals, describe the bonding in and the geometry of the following molecules; draw as accurate a picture as possible. CH3CHCH2 CH3CH20H CH3COOH ' 3 p3 kl H» 0 loan“? H A ll | / / _. A \ W./ /H‘ +} H'\ C—éofiy ‘3‘ C26: v V? \ I ‘2 I H/ 7 \H 3”? 50 59" Pm“ \§ 1 «9? W m. ml 5 '5 P 1'61”- (P planM 1’63” mkedml ' +rtyamj @0313) Score: 6. (15 ptg) The planar molecule hexatriene is shown below. Using the particle—in~a—box wavefunctions as a guide indicate the linear combinations (just use plus and minus signs) of appropriate 2p orbitals that are required to accomodate the TC electrons in this system (the three lowest—energy molecular orbitals). Schematically indicate the electron density contribution of each. H /H \C= C /H \ H H/ C: C\ / / __ H/ H @933 Particle—m-a-box wave functions W slgmpattem of coeffimems Schematic pictures of the TC electron distribution Score: I S ...
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This note was uploaded on 04/08/2012 for the course CHEM 101 taught by Professor Draper during the Spring '06 term at Johns Hopkins.

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Key-3 - Chemistry 30.102 Third Examination Spring 2011 K63...

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