Multiple Bonds Another View Ethene aka ethylene C2H4 End on overlap of two sp2 orbitals forms sigma bond side overlap of two p orbitals forms pi bond ConcepTest Which orbitals overlap to account for the double bond in H2C NH A sp with sp p with p B sp3 with sp3 p with p C sp2 with sp2 p with p D sp3 with sp3 sp2 with sp2 E sp2 with sp2 sp2 with sp2 F none of these H H C N H C N H Geometries and shapes cis and trans geometries o can t rotate o Cis same side o Trans opposite side Benzene rings ConcepTest which substituted ethylene can occur as cis and trans isomers A H2C CH2 B F2C CH2 C FHC CH2 D F2C CF2 E FHC CHF 93 175 75 82 175 99 09 05 87 05 100 025 2 80 16 275 13 2685 4 9545 4 35 2 5 41 348 47 5 87 67 5 MO Theory Principles Sets of MOs for molecules Mathematics symmetry pairs of bonding anti bonding MOs Bonding MO lower in E than AO anti bonding higher Fill from lowest energy ConcepTest Which of these are parts of molecular orbital theory I Anti bonding orbitals true II Bond order bonding electrons anti bonding electrons true III Hybrid orbitals false valence bond A I and II B I and III C II and III D I II and III E none of these According to molecular orbital theory which molecule has a bond order greater than zero A He2 B Li2 C both He2 and Li2 D neither He2 and Li2 1s with 1s and 2s with 2s to form sigma MOs Li2 MOs sigma1s 2 sigma 1s 2 sigma2s 2 Be2 MOs core electrons sigma2s 2 sigma 2s 2 Combinations of p to from sigma or pi MOs MOs of B2 C2 N2 MO theory examples carbon monoxide different atoms C 4 valence electrons O 6 valence electrons v v v v v Together v v v 6 0 3 bonds v v no net bonds Module 10 1 Gas Pressure 2 Gas Laws 3 Ideal Gas Law 4 Gas Laws and Reactions 5 Gas Mixtures and Partial Pressures 6 The Kinetic Molecular Theory of Gases 7 Diffusions and Effusion of Gases 8 Non Ideal Behavior 1 3 Exam 4 4 8 Final ConcepTest Which is NOT a measure of one atmosphere of pressure A 760 torr B 29 9 inches Hg C 14 7 psi D 33 9 inches H2O feet not inches E all of these are equivalent measures of pressure