CHM 2045C Module Four    Sample Exam                  Name:___________________

 

Module Four- Part P: Hybrid Orbitals of Molecules      10 points

Use the dot/stick structures in the table to predict the hybrid orbitals that overlap to form the covalent bond:

 

 

_____________1.  H2O   the sigma bond

                              between either  H-O

 

_____________2.  CO2  the sigma bond

                              between either C=O

_____________2a.  CO2      the pi bond

                               between either C=O

 

_____________3.    C2H4   the sigma bond

                               between the two carbons

_____________3a.  C2H4   the pi bond

                               between the two carbons

 

_____________4.    SO2  the sigma bond

                               between S=O

_____________4a.  SO2  the pi bond

                               between S=O

____________4b.  SO2  the sigma bond

                               between S-O

 

____________ 5.    SO3   either sigma bond

                               between S-O

____________ 5a.  SO3   the sigma bond

                              between S=O

____________ 5b.  SO3   the pi bond

                              between S=O

 

____________6.    HCN  the single (sigma)

                              bond between H-C

____________6a.  HCN  the sigma bond

                              between C=N

____________6b.  HCN  either pi bond

                              between C=N

 

____________7.  CH4  the sigma bond

                              between any of the H-C

 

____________8.  NH3  the sigma bond

                              between any of the H-N

 

___________  9.   CH2O  either sigma

                              bond between the H-C

____________9a.  CH2O  the sigma  bond

                              between the C=O

____________9b.  CH2O  the pi  bond

                              between the C=O

 

___________ __10.   C2H2   the sigma bond

                              between the C=C

_________ ____10a. C2H2   either pi bond

                            between the C=C

_____________ 10b. C2H2  the sigma

                    bond between any of the H-C

 

 _________________Bonus. PF5    P-F            

 _________________Bonus  SF6      S-F

 

 

 

 

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You draw the structures of the bonus!

What is difference between a Sigma (σ) and a pi (π) bond?