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Name
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Molecular Geometry – Review Sheet
Part I: For each of the following molecules, draw the Lewis Diagram then, identify the correct
the molecular shape and bond angle. Finally, determine if the molecule is polar or nonpolar.
MOLEC
ULE
1. SeO3
2. AsH 3
3. NO2 -
4.
BeFCl
LEWIS DIAGRAM
SHAPE
BOND ANGLE
POLAR OR
NONPOLAR
MOLECULE
5. SiH2 Br2
6. SeH2
7. PF5
8. SCl6
LEWIS DIAGRAM
SHAPE
BOND ANGLE
POLAR OR
NONPOLAR
Predicting Molecular Geometry
Part II: In each case, predict the approximate bond angle(s), around the central atom (Note: It
is helpful to first sketch the Lewis stucture!)
Molecule or Ion 
(1) OF2
(2) H2CO
(3) NO2+
(4) BF3
(5) SbF3I 2
(a) No. of valence e - ‘s
(b) Lewis structure
(c) Approximate bond
angle(s)
(d) Polar or non-polar
molecule?
(e) Molecular Geometry
name
Ion: always
polar!
(f) Electronic Geometry
______________________________________________________________________________
Part II cont.: For each of the molecules below fill in the indicated items in the chart. The
central atoms are underlined.
Molecule
(1) SO2
(2) HBF2
(3) XeF4
(5) NF3
(4) CH2Cl2
(a) No. of valence e - ‘s
(b) Lewis structure
(c) Approximate bond
angle(s)
(d) Polar or non-polar
molecule?
(e) Geometry name
(f) Electronic geometry
List the molecular geometry shape names for the molecules which will always be
polar…regardless of the atoms bonding to the central atom:
Part III: For each of the following pairs of compounds, determine which is most polar based on
their Lewis structures and the atoms involved in the molecule.
1)
methyl chloride (CHCl3 ) or methyl bromide (CHBr3)
2)
water or hydrogen sulfide (H2S)
3)
hydrochloric acid (HCl) or hydroiodic acid (HI)
4)
bromoacetylene (C 2HBr) or chloroacetylene (C2HCl)
5)
carbon tetrachloride (CCl4) or xeon tetrachloride (XeCl 3F)
Part IV: Draw all resonance structures for the following molecules and use formal charges to
determine the most stable choice between structures.
(a) SCN -
(b) SO3
Part V: Bond Energy
Calculate the change in enthalpy for the following reaction. See POGIL for average bond energy
values.
H2 + N2  NH3