CHM 2210C Chapter 1 Sample Exam Name:_____Answers______

Chapter 1- Part H: 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-sp^3_____1. H2O the sigma bond between either H-O _____sp-sp^2___2. CO2 the sigma bond between either C=O _____p-p______2a. CO2 the pi bond between either C=O ____sp^2-sp^2____3. C2H4 the sigma bond between the two carbons ____p-p_______3a. C2H4 the pi bond between the two carbons _____sp^2-sp^2___4. SO2 the sigma bond between S=O _____p-p______4a. SO2 the pi bond between S=O _____sp^3-sp^2___4b. SO2 the sigma bond between S-O _____ sp^3-sp^2__ 5. SO3 either sigma bond between S-O _____ sp^2-sp^2__ 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-sp^3___7. CH4 the sigma bond between any of the H-C ______ s-sp^3___8. NH3 the sigma bond between any of the H-N _____ s-sp^2____ 9. CH2O either sigma bond between the H-C _____ sp^2-sp^2___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 __sp^3d-sp^3________Bonus. PF5 P-F __sp^3d^2-sp^3_______Bonus SF6 S-F

. You draw the structures of the bonus!

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