141 Molecular Models Worksheet

					                                                                       Name______________________
                           Molecular Models Worksheet
Species               Lewis Structure and resonance structures including   Molecular geometry
                      formal charge
HCN

tell the
hybridization of
                                                                           Hybridization
both the C and N
                                                                           Carbon ________
                                                                           Nitrogen________

Valence                                                                    Orbital geometry
electrons



                      H-C-N bond angle

Species               Lewis Structure and resonance structures including   Molecular geometry
                      formal charge
BF3
Show all possible
resonance
structures. Tell
which are likely to                                                        Hybridization
form


Valence                                                                    Orbital geometry
electrons



                      F-B-F bond angle

Species               Lewis Structure and resonance structures including   Molecular geometry
                      formal charge
NO2
show both
resonances
structures and
charges                                                                    Hybridization



Valence                                                                    Orbital geometry
electrons


                      O-N-O bond angle
Species     Lewis Structure and resonance structures including   Molecular geometry
            formal charge
CHCl3


                                                                 Hybridization



Valence                                                          Orbital geometry
electrons



            H-C-Cl bond angle

Species     Lewis Structure and resonance structures including   Molecular geometry
            formal charge
H 2O


                                                                 Hybridization



Valence                                                          Orbital geometry
electrons



            H-O-H bond angle

Species     Lewis Structure and resonance structures including   Molecular geometry
            formal charge
BeCl2


                                                                 Hybridization



Valence                                                          Orbital geometry
electrons



            Cl-Be-Cl bond angle



                       Molecular Models 2
Species          Lewis Structure and resonance structures including   Molecular geometry
                 formal charge
CS2


                                                                      Hybridization



Valence                                                               Orbital geometry
electrons



                 S-C-S bond angle

Species          Lewis Structure and resonance structures including   Molecular geometry
                 formal charge
O3
show resonance
structures and
charges
                                                                      Hybridization



Valence                                                               Orbital geometry
electrons



                 O-O-O bond angle

Species          Lewis Structure and resonance structures including   Molecular geometry
AsCl5            formal charge



                                                                      Hybridization



Valence                                                               Orbital geometry
electrons



                 Cl-As-Cl bond angles              and



                            Molecular Models 3
Species     Lewis Structure and resonance structures including   Molecular geometry
            formal charge
XeF4


                                                                 Hybridization



Valence                                                          Orbital geometry
electrons



            F-Xe-F bond angle

Species     Lewis Structure and resonance structures including   Molecular geometry
            formal charge
ICl3


                                                                 Hybridization



Valence                                                          Orbital geometry
electrons



            Cl-I-Cl bond angle

Species     Lewis Structure and resonance structures including   Molecular geometry
SO3-2       formal charge



                                                                 Hybridization



Valence                                                          Orbital geometry
electrons



            O-S-O bond angle



                       Molecular Models 4
Species                 Lewis Structure and resonance structures including   Molecular geometry
                        formal charge
SO2
show resonances
structures and
charges
                                                                             Hybridization



Valence                                                                      Orbital geometry
electrons



                        O-S-O bond angle

Species                 Lewis Structure and resonance structures including   Molecular geometry
                        formal charge
P4

look on the web for
geometry, tell the
orbital and molecular                                                        Hybridization
geometry around one
of the phosphorous
atoms. Draw the
entire molecule

Valence                                                                      Orbital geometry
electrons



                        P-P-P bond angle

Species                 Lewis Structure and resonance structures including   Molecular geometry
SF6                     formal charge



                                                                             Hybridization



Valence                                                                      Orbital geometry
electrons



                        F-S-F bond angle



                                   Molecular Models 5
Species                   Lewis Structure and resonance structures including formal   Molecular geometry
                          charge
I3-1

Don’t forget the formal
charges
                                                                                      Hybridization



Valence electrons                                                                     Orbital geometry



                          I-I-I bond angle

Species                   Lewis Structure and resonance structures including formal   Orbital geometry
                          charge
H2C2O4                                                                                C3
                                                  4O      5O

                                                                                      O2
                                   1H        2O   3C      6C    7O       8H


                          Redraw with proper geometry                                 Hybridization
Valence
electrons                                                                             C3


                                                                                      O2



Species                   Lewis Structure and resonance structures including formal   Molecular geometry
                          charge
AsCl3F2

be sure and put the                                                                   Hybridization
F’s in the correct
positions


Valence electrons                                                                     Orbital geometry




                                        Molecular Models 6
Species                   Lewis Structure and resonance structures including formal   Molecular geometry
                          charge
SO4-2
look for some resonance
structures that expand
the valence of sulfur.
Remember to show the                                                                  Hybridization
formal charges




Valence electrons                                                                     Orbital geometry




                          O-S-O-bond angle

Species                   Lewis Structure and resonance structures including formal   Molecular geometry
                          charge
SF4


                                                                                      Hybridization



Valence electrons                                                                     Orbital geometry




                          F-S-F-bond angles               and

Species                   Lewis Structure and resonance structures including formal   Molecular geometry
                          charge


                                                                                      Hybridization



Valence electrons                                                                     Orbital geometry




                                       Molecular Models 7
C6H6                                                   Hybridization of
                                                       carbon
C6H6 is benzene.           C                   C
Show the two
                      C          C         C       C
resonance
structures for this
molecule.                                  C       C   C-C-H bond angle
                      C          C
                           C                   C


C6H12                                                  Hybridization of
                                                       carbon
C6H12 is                               C
cyclohexane.
                                 C         C
There will be one
large ring formed
out of the carbon                                      C-C-H bond angle
                                 C         C
atoms. .
                                       C



C3H6

C3H6 has two
distinct isomers.
Draw each one.



C4H8

C4H8 has many
possible
variations. Draw
5 distinct
possibilities.




                      Molecular Models 8
C4H9OH

Draw 4 distinct
variations, each
will have an OH
group attached.
Do not try to
create any
isomers without
an OH group!




CH2O                                                                     Which structure
                                                                         makes most sense
HCHO is                O                                       C         and why?
formaldehyde.
Determine the          C                                       O
best structure.    H            H                      H           H


                   Structure 1                             Structure 2
HCO2H                                                                    Give bond angles
                                      3                                  for
                                      O                                  H1-C2 -O3
                                               4           5
                                                                         C2-O4 -H5
                           1H         2C       O           H


CH3CO2H                                                                  Give hybridization
                                 H        3                              of numbered atoms
                                           O
                                                   4                     1
                        H        1C       2C       O           H
                                                                         2
                                 H                                       3

                                                                         4




                   Molecular Models 9
Draw arrow            Bond          Dipole      Electrostatic Potential Surface (Several
representing dipole   Angle         moment      orientations are shown for each molecule)
moment where
appropriate
                      H–C–H



         H

  H C H
   H



                      H – C – Cl



          H

   Cl C Cl            Cl – C – Cl

    Cl



                      H–N–H




  H N H
   H




                          Molecular Models 10
Draw arrow            Bond       Dipole        Electrostatic Potential Surface (Several
representing dipole   Angle      moment        orientations are shown for each molecule)
moment where
appropriate
                      H–O–H




           O
 H               H


                      F–N–F




  F        N
                 F
       F



                      F–P–F




  F        P
                F
       F




                         Molecular Models 11
Spartan Questions

   1. Explain why the bond angles increase or decrease in the following series: H—C—H bond in CH4 ,
      H—N—H bond in NH3;        H—O—H bond in H2O.




   2. Explain the differences between the H—C—H bond angle in CH4 and the bond angles in CHCl3
      (Be sure to consider both the Cl—C—Cl and H—C—Cl bonds in CHCl 3.)




   3. Compare the dipole moments and bond angles for NH3, NF3, and PF3 . Does each dipole vector
      point in the same direction? Explain.
                         NH3                     NF3                   PF3
      Dipole moment


      Bond angles




                               Molecular Models 12

				
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