Chem 161 Chapter 9 Molecular Geometry Worksheet - Shape Determines Function Page 29
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40Each C–H bond and the first C–C bond all have a region of direct overlap where the shared
electrons are located—these are all sigma (σ) bonds, as shown below:
Note: The atomic orbital diagram for each C atom drawn in step 6 C shows an unhybridized p
orbital. The second C–C bond forms from the two electrons in the unhybridized p orbitals.
2
– Each C atom has an unpaired electron in the 2p
orbital, which is perpendicular to the sp
z
orbitals forming the C–H and first C–C bond.
– These two electrons in the 2p
bond via a sideways overlap as shown above.
z
Note: The carbon-carbon double bond in C
H
is made up of the following:
2
4
The σ bond is the first C–C bond, and the two lobes above and below (indicated as π
bond) together make up the π bond, which is the second C–C bond.
Triple Bond Case: C
H
:
2
2
1. Draw the Lewis structure for C
H
using the skeletal structure below:
2
2
_____ σ bonds
H
C
C
H
_____ π bonds
2. The shape around each C is ____________________, and the bond angle is __________.
3. Electron configuration for C (using core notation): ___________________
4. Given the shape around each C atom, C has _________ atomic hybrid orbitals.
5. Draw the atomic orbital diagram for
the valence electrons in C, promoting
electrons, so C can form 4 bonds.
CHEM
1 61:
C hapter
9
page
2 9
o f
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