Molecular Models - DOC by HC120727213242

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									Molecular Models                                        Name ____________________

You will construct models for each of the molecules listed below. Use the following key:
black = Carbon         green = Halogens          white = Hydrogen
yellow = Sulfur        red = Oxygen              orange = Nitrogen or Phosphorus

Long springs are used to make double and triple bonds, and short springs are single bonds
(Boys, these kits are expensive and won’t work without springs – don’t shoot them!)

                                     Molecular shapes
Molecular Models                                  Name ____________________

Molecule     Lewis Structure     Bond Type        molecular shape              Dipole
                               (polar/covalent)    (see chart)                 (yes/no)


1. CO2                          ______________    _______________________   ______________




2.   SO2                         ______________   _______________________    ______________




3. PCl3                         ______________    _______________________   ______________




4. CCl4                         ______________    _______________________   ______________




5.   NH3                        ______________    _______________________   ______________




6. H2O                          ______________    _______________________   ______________




7. CH4                          ______________    _______________________   ______________




8. NF3                          ______________    _______________________   ______________




9. NCl3                         ______________    _______________________   ______________




10. CO3 -2                      ______________    _______________________   ______________




11. NO2-1                       ______________    _______________________   ______________




12. NO3-1                       ______________    _______________________   ______________
Bigger and Trickier molecules

                       Lewis Structure

N2F2



S3Cl2



C2H2



N2O


Questions

1.      Which of the following molecules would you predict to have the lowest boiling point?
        PCl3 CH4 H2O CO2 SO2 Explain your reasoning.




2.      Some of these molecules have polar bonds, but do not have a dipole moment.
        How is this possible?




3.      Which molecular shapes are most likely to have a dipole moment?



        Which shapes are least likely?
         Boiling points
1. CO2            -78.5 C




2.    SO2         -10


3. PCl3           76.1 °C




4. CCl4           76




5.    NH3         -35




6. H2O            100


7. CH4            −162 °C




8. CS2            46




9. NCl3           71°C


10.         NF3

11.      OF2

         12.      SiBr4

								
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