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

. You draw the structures of the bonus!

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