Chem Module 5

Question 1

Valence Bond Theory

Answer 1

Electrons are shared in overlapping/modified atomic orbitals
- building a molecule atom by aom using appropriate atomic orbitals
- how a single elctron interacts with one nucleus

Question 2

Molecular Orbital Theory

Answer 2

Molecule has a set of molecular orbitals
- building a molecule electron by electron using appropriate molecular orbitals
- how a single electron interacts with two or more nuclei

Question 3

Atom hybridization of sp, how many groups and their bond angles

Answer 3

2 , 180 degrees, linear

Question 4

Atom hybridization of sp^2

Answer 4

3 groups, 120 degrees, trigonal planar

Question 5

Atom hybridization of sp^3

Answer 5

4 groups, 109.5 degrees, tetrahedral

Question 6

which has more energy; sp^2 or sp orbitals

Answer 6

sp^2, because it has less s-character

Question 7

What does a combination of atomic orbitals produce?

Answer 7

a bonding orbital and an antibonding orbital

Question 8

Whats the difference between an intibonding molecular orbital and a bonding molecular orbital

Answer 8

antibonding MO has a nodal plane (the internuclear axis) and bonding MO dont

Question 9

sigma orbitals

Answer 9

arise from s or p orbitals that overla along the internuclear axis

Question 10

pi orbitals

Answer 10

arise from p orbitals that overlap off the axis

Question 11

molecular orbital diagram for H atom to N atom

Answer 11

sigma 2p bond higher than pi 2p bond

Question 12

molecular orbital diagram for O atom and F atom

Answer 12

pi 2p bond higher than sigma 2p bond