chem 1145 exam 4

) Construct a molecular orbital diagram for a Li 2 molecule. According to molecular orbital theory, the σ 1s orbital is ________ and the σ 1s * orbital is ________.

) filled, filled

3) An antibonding MO ________ the corresponding bonding MO

) is always higher in energy than

1) According to molecular orbital theory, the bond order of He-He in the He 2 molecule is

A) 0

7) How many hybrid orbitals are formed upon the mixing of three atomic orbitals

A) three

) Of the following, only ________ has sp 2 hybridization of the central atom

B) BF 3

10) The electron-domain geometry of a boron-centered compound BH 3 is trigonal planar. The hybridization of the central boron atom is ________.

B) sp 2

9) The more effectively two atomic orbitals overlap, ________.

B) the lower will be the energy of the resulting bonding MO and the higher will be the energy of the resulting antibonding MO

8) How many unhybridized p atomic orbital(s) are found in an sp-hybridized carbon atom

C) 2

6) Mixing one s atomic orbital and one p atomic orbital gives rise to

D) two sp hybrid orbitals

2) Which of the following molecules would be expected to be attracted to a magnetic field

E) O 2 only