Notes taken during lecture

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31 Dec 2010
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N.B. I actually will not be scanning the slides, as there is really no need. Unless diagrams
pop up, I will only be typing up the notes I take during lecture. If you have questions or
would like clarification, email at jingwei.chen@utoronto.ca.
LECTURE 4 – Bonding and Atmospheric Chemistry
Slide No. Notes
Last
lecture
slide 24
-Ans: C
-Wavelength is inversely proportional to energy, so energy increases
in the opposite direction as wavelength
-The rightmost lines are 4->3, then 5->3, then 6->
BONDING
1-expanded octets possible – with d-orbitals being part of bonding
-1s orbitals have only two electrons
-valence electrons important for bonding
2-low ionization energy – easy to remove an electron
-electron affinity – energy associated with gaining an electron
-high electron affinity means that lots of energy are released when
electron gained
-oppositely charged ions attract each other
-surround each other – to maximize electrostatic forces
3-bringing them together lowers energy
-attraction of one hydrogen electron to nucleus of the other hydrogen
-there is an ideal distance for bonding
4-F highest – since smallest radius therefore electron close to nucleus
so attraction is very strong
-EX.
-H2 is non-polar covalent bond
-HF is polar covalent
-LiF is ionic
-Ionic bonds are between a metal and a non-metal
7-D
-There is a total dipole moment pointing to the left
8-electrons hate each other
-electron group can be a pair of electrons in a bond; 4 electrons in a
double bond, or 6 electrons in a triple bond; lone-pair
9- octahedral geometry – all bonds are 90 degrees
10 -water – angle between O-H bonds are 105 degrees
-this is a bent geometry because of the LPs
-LP on oxygen, not shared therefore more repulsive, attracted to just
one nucleus (the oxygen)
-If asked if something have a dipole moment, first determine shape
11 -5 electron groups
-lone pair tries to be as far away from the other electron groups
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Document Summary

I actually will not be scanning the slides, as there is really no need. Unless diagrams pop up, i will only be typing up the notes i take during lecture. If you have questions or would like clarification, email at jingwei. chen@utoronto. ca. Wavelength is inversely proportional to energy, so energy increases in the opposite direction as wavelength. The rightmost lines are 4->3, then 5->3, then 6-> expanded octets possible with d-orbitals being part of bonding. F highest since smallest radius therefore electron close to nucleus so attraction is very strong. There is a total dipole moment pointing to the left. Ionic bonds are between a metal and a non-metal electrons hate each other electron group can be a pair of electrons in a bond; 4 electrons in a double bond, or 6 electrons in a triple bond; lone-pair. Octahedral geometry all bonds are 90 degrees. Water angle between o-h bonds are 105 degrees.

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