CHEM 121 FINAL EXAM | UPDATED QUESTIONS AND
ANSWERS UPDATED .Buy Quality Materials!
number of pairs: 2
linear, 180', sp hybridization, nonpolar
drawing: linear
number of pairs: 3
3 bonded, 0 lone: trigonal planar, 120', sp^2 hybridization, nonpolar
2 bonded, 1 lone: Bent/V-shaped, 104.5', sp^2 hybridization, polar
drawing: trigonal planar
number of pairs: 4
4 bonded, 0 lone: tetrahedral, 109.5', sp^3 hybridization, nonpolar
3 bonded, 1 lone: trigonal pyramidal, 107', sp^3, polar
2 bonded, 2 lone: bent/v-shaped, 104.5', sp^3, polar
drawing: tetrahedral
number of pairs: 5
5 bonded, 0 lone: Trigonal bipyramidal, 90' and 120' and 180', sp^3d hybridization,
nonpolar
4 bonded, 1 lone: see-saw, 90' and 120' and 180', sp^3d, polar
3 bonded, 2 lone: T-shaped, 90' and 180', sp^3d, polar
2 bonded, 3 lone: linear, 180', sp^3d, nonpolar
drawing: trigonal pyramidal
number of pairs: 6
6 bonded, 0 lone: octahedral, 90' and 180', sp^3d^2 hybridization, nonpolar
5 bonded, 1 lone: square pyramidal, 90' and 180', sp^3d^2, polar
4 bonded, 2 lone: square planar, 90' and 180', sp^3d^2, nonpolar
drawing: bent
drawing: trigonal bipyramidal
drawing: octahedral
Determining formal charge rules
Formal charge= (# valence e-'s neutral atom) - (# valence e-'s on atom in structure)
LE model tricks
1. Organic mole can never have lone pairs
2. F never forms multiple bonds and Be and B (and B group) like to be electron deficient
3. Atoms in third row and larger can exceed octet
3. If formal charge isn't 0 then the most electronegative atom gets the negative charge
MO order for group 2 elements
Sigma 2s, sigma 2s, pi 2p, sigma 2p, pi 2p, sigma 2p*
For O2 and F2 only: sigma 2s, sigma 2s, sigma 2p, pi 2p, pi 2p, sigma 2p*
Quirks: for heteronuclear diatomic molc. assume orbitals from less electronegative atom
B2 MO's
paramagnetic, bond order=1 cations become smaller
C2 MO's
diamagnetic , bond order=2 cations become smaller
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller SUPERGRADES01. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $8.09. You're not tied to anything after your purchase.
