CP Chemistry
Mrs. Klingaman
Chapter 6:
Molecular
GEOMETRY
Name: _______________________________________________
Mods: _____________________________
Chapter 6: Molecular Geometry
1. VSEPR theory enables us to predict the shape (molecular geometry) of molecules based on
the representative Lewis structure for each molecule. VSEPR stands for:
V- ___________________________
S- ___________________________
E- ___________________________
P- ___________________________
R- ___________________________
2. VSEPR theory predicts the _________________________ of molecules based on the fact that
there is ____________________________ between the valence electrons surrounding the
central atom of molecule.
a. Bonding electrons pairs (single/double/triple bonds) take up space in a molecule and
repel one another
b. Unshared/nonbonding electron pairs also take up space in a molecule and repel
electrons __________________ strongly than bonding electron pairs
c.
As a result of this repulsion, the atoms in a molecule space themselves out
____________________________________ from one another as possible. ***
3. Fill in the table below:
Name &
Formula
Lewis
structure
#
atoms
bonded
to
central
# nonbonding
electron
pairs
around
central
# of
domains
around
central
ABN type*
Molecular Shape
Methane
CH4
Ammonia
NH3
Water
H2O
* Write the ABN formula for each of these molecules.
A= central atom, B= number of attached atoms, N= Number of lone pair electrons.
Use this notation to determine the shape of each molecule and fill in your answer in the table.
4. Molecular Polarity:
Understanding molecular shape allows us to think about molecular polarity.
Molecules that are symmetrical are often considered non-polar
Molecules that are asymmetrical (not the same on all sides) are often considered polar.
Using the Lewis structures and molecular shape from the table in #3 above, predict if the
molecules below are polar or nonpolar:
a) Methane = __________________________
b) Ammonia = _________________________
c) Water = ___________________________
Now You Try:
Molecule
Lewis Dot Structure
# of
Atoms
Bonded
to
Central
# of
Nonbonding
e– Pairs
# of
domains
around
central
ABN type
Molecular Shape
ClO3–
CHO–
Based on molecular shape and symmetry, circle the correct polarity of each molecule:
ClO3– :
polar
or
nonpolar
CHO– :
polar
or
nonpolar
The chart at the front of this packet lists possible shapes of molecules, based on
their Lewis structure and ABN type.
Be comfortable with interpreting this information…like you just did!
VSEPR – Predicting Molecular Shapes
Directions: Fill in the table below by drawing the Lewis Structure of the molecule and determining its
ABN type and molecular shape
Molecule
CCl4
CO2
ClF3
XeBr2
Lewis Dot Structure
# of
atoms
bonded
to central
# of nonbonding e–
pairs on
central
# of
domains
around
central
ABN Type
Molecular Shape
Molecule
IBr5
PH5
NO2–
SCl6
XeF4
Lewis Dot Structure
# of
atoms
bonded
to central
# of nonbonding e–
pairs on
central
# of
domains
around
central
ABN Type
Molecular Shape
Molecule
HCN
CHBr3
HCl
O3
I3–
Lewis Dot Structure
# of
atoms
bonded
to central
# of nonbonding e–
pairs on
central
# of
domains
around
central
ABN Type
Molecular Shape