IMFs
List the IMFs from strongest to weakest (make sure you include all of them!)
Ion dipole
H-bond
D-D
LDf
What is polarity?
An unequal sharing of electrons in covalent bonds leading to partial charges.
What does vapor pressure mean?
Its the ability for a substance to become a gas. Lower vapor pressure means it is hard to boil.
How many valence electrons will you have total for the lewis dot structure of SO2
18 total
S = 6
Ox2 = +6x2
18
What is the strongest IMF that would be present for NH3?
H-Bonds
Would PH3 be polar or nonpolar?
It has an unshaired pair on the center atom so it is polar
What does having stronger IMFs mean?
Draw the Lewis dot structure for CH3F
H
l
H -- C -- F
l
H
List all the IMFs that would be present between two molecules of HCl
LDF
D-D
Would N2 be polar or nonpolar
nonpolar
Which will have a high boiling point?
HCl or HF
HF because it does hydrogen bonds which is a stronger IMF than HCl's dipole dipole.
Draw the Lewis dot structure for CH2O
H
l
C = O
l
H
Which would have weaker IMFs, SO2 or O2?
O2
Tts nonpolar so it will have LDFs at most
Would O3 be polar or nonpolar
polar
Which will have a LOWER melting point?
CH4O or HCN
CH4O has a hydrogen bond so HCN will have a lower melting point because it has weaker IMFs
Draw the lewis dot structure for CHN
H
l
C
lll
N
What would be the IMFs present in a molecule of XeF2?
Its polar because of the unshaired pairs of electrons on the expanded octet. So....
LDF and D-D
What would be the polarity of XeCl2
Polar because it is an expanded octet and has unshaired pairs of electrons on the Xe.
Which of these two molecules will have a high vapor pressure?
CH4 or C2H6
CH4
Lower IMFs means high vapor pressure. They both only have LDFs but C2H6 is bigger so it has a little stronger IMFs.
Draw all the resonance structures for O3
There should be two
O=O-O
and
O-O=O