Week 17

Question 1

Pie and sigma bonding

Answer 1

Pie is different when you flip the bonds
And sigma bonding is the same

Hold two fingers out like a pair of scissors and flip them around to figure out

Question 2

Gerade

Answer 2

When their the same

Question 3

Ungerade

Answer 3

When their different

Question 4

Paramagnetic

Answer 4

A compound with unpaired electrons are paramagnetic and are attracted to magnetic fields

Question 5

Diamagnetic

Answer 5

Those with paired electrons are called diamagnetic

Question 6

S-p mixing

Answer 6

S and o orbitals on adjacent atoms can interact if they point towards each other

Question 7

What three elements are changed by s-p mixing

Answer 7

Boron, carbon and nitrogen

For oxygen and so on s-p mixing is too small that it doesn’t affect ordering if the orbitals

Question 8

LCAO

Answer 8

the better the spatial overlap between orbitals, the stronger the bonding
The better the energy match between orbitals, the stronger the bonding
For heteroatomic bonds the bonding orbital will be closer in shape and energy to the lowest energy contributing orbital and the anti-bonding orbital will be closer in shape and energy to the highest

Question 9

Strength of heteroatomic bonds

Answer 9

Atoms get bigger as you descend the periodic table so the spatial overlap is worse