CHEM 1AA3 Lecture Notes - Lecture 5: Formal Charge, Carboxyhemoglobin, Bromine
12 Mar 2014
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Chem 1a03 lecture 6 chemical bonding continued. **ch 8,9,10 and fundamental skills review is the content on the midterm. Hemoglobin: o2 molecule binds to iron of the heme unit, geometry around iron changes as o2 is bound vs. free, carboxyhemoglobin: co binds competetively to the heme unit and displaces o2. >200 ppm = dizziness + convulsions: saturation with oxygen can reverse the process. Resonance structure: average formal charge for an atom = total charges on atom / total # of that atom, average bond order = total number of 1 type of bond / # of places where bond is found. Linear ax2 180o: trigonal planar ax3 (120) ax2e (<120 non ideal, tetrahedral ax4 (109. 5) ax3e (trigonal pyramidal (<109. 5 non ideal) ax2e2 (angular <109. 5) A molecule with polar bonds can be polar or non-polar. Polar molecules have a permanent dipole (polarization of charge) u = o x d u dipole moment (debye, d: partial charge (coulomb, c) d distant (m)
