CHM 2045C Module Four    Sample Exam                  Name:_____Answers______

 

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:

 

 

____s-sp3_____1.  H2O   the sigma bond

                              between either  H-O

 

_____sp-sp2___2.  CO2  the sigma bond

                              between either C=O

_____p-p______2a.  CO2      the pi bond

                               between either C=O

 

____sp2-sp2____3.    C2H4   the sigma bond

                               between the two carbons

____p-p_______3a.  C2H4   the pi bond

                               between the two carbons

 

_____sp2-sp2___4.    SO2  the sigma bond

                               between S=O

_____p-p______4a.  SO2  the pi bond

                               between S=O

_____sp3-sp2___4b.  SO2  the sigma bond

                               between S-O

 

_____ sp3-sp2__ 5.    SO3   either sigma bond

                               between S-O

_____ sp2-sp2__ 5a.  SO3   the sigma bond

                              between S=O

_____ p-p_____ 5b.  SO3   the pi bond

                              between S=O

 

______ s-sp____6.    HCN  the single (sigma)

                              bond between H-C

______ sp-sp___6a.  HCN  the sigma bond

                              between C=N

______ p-p_____6b.  HCN  either pi bond

                              between C=N

 

______ s-sp3___7.  CH4  the sigma bond

                              between any of the H-C

 

______ s-sp3___8.  NH3  the sigma bond

                              between any of the H-N

 

_____ s-sp2____  9.   CH2O  either sigma

                              bond between the H-C

_____ sp2-sp2___9a.  CH2O  the sigma  bond

                              between the C=O

_____ p-p______9b.  CH2O  the pi  bond

                              between the C=O

 

______ sp-sp __10.   C2H2   the sigma bond

                              between the C=C

______ p-p ____10a. C2H2   either pi bond

                            between the C=C

______ s-sp___ 10b. C2H2  the sigma

                  bond between any of the H-C

 

 __sp3d-sp3________Bonus. PF5    P-F            

 __sp3d2-sp3_______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?