Which of these are polar?
CH
3
Cl CH
4
CCl
4
CH
3
Cl and SO
2
Which of these are polar?
NH
3
CO
2
H
2
O
H
2
O and NH
3
SO
CH
3
CH
3
2
Which of these are polar?
CH
2
=CH
2
CH
3
OH CH
3
NH
2
CH
3
OH and CH
3
NH
2
What do we call the attractive forces between an ion and a polar molecule?
Ion-Dipole
What do we call the attractive forces between polar molecules?
Dipole-dipole
What do we call the attractive forces between metal atoms?
Metallic
What do we call the attractive forces between nonpolar molecules?
London dispersion

What do we call the attractive forces between carbon atoms?
Network covalent
What do we call the attractive forces between hydrogen and nitrogen, fluorine, or oxygen.
Hydrogen bonding
Which forces compete to determine whether or not an ionic substance will dissolve in water?
Competition between the ion-ion forces within the compound and ion-dipole forces between ions and water molecules. If ion-dipole forces are stronger-solid dissolves.
Name the IMF?
Liquid nitrogen
London dispersion
Chromium metallic
Calcium oxide ionic
Silicon tetrahydride
London dispersion

Potassium hydroxide ionic
Hydrogen sulfide
Dipole-dipole
Methanol
Hydrogen bonding
Silicon dioxide
Network covalent
Why?
BrF has a higher MP than ClF
BrF is more polar than ClF (larger diff in electronegativity)
KBr has a higher MP than BrCl
Ionic stronger than dip-dip
BrCl has a higher MP than Cl
2
Dip-dip stronger than L.D.
K has a higher MP than Br
2
Metallic stronger than L.D.

MP of NaF is 1700˚C and
-127˚C for BF
2
Ionic stronger than L.D.
MP of NaF is 1700˚C vs 1413˚C for NaCl
Ionic-smaller radius stronger than larger radius
Lowest to highest BP
KNO
3
, CH
3
OH, C
2
H
6
, Ne
Ne, C
2
H
6,
CH
3
OH, KNO
3
Highest to lowest MP
NaCl, Na, Cl
2
, SiO
2
SiO
2
, Na, NaCl, Cl
2
Lowest to highest BP
C
Diamond
, CH
4
, NaNO
3
, C
3
H
5
(OH)
3
, Cu
CH
4
, C
3
H
5
(OH)
3
, NaNO
3
, Cu, C diamond
Highest to lowest BP
AsH
3
, NH
3
, SbH
3
, PH
3
NH
3
, SbH
3
, AsH
3
, PH
3

Lowest to highest BP
H
2
O, H
2
Te, Cs, H
2
S, H
2
Se
H
2
S, H
2
Se, H
2
Te, H
2
O, Cs
Highest surface tension
HCl, Ar, F
2
HCl
Highest viscosity
H
2
O, NaCl, HF
NaCl
Lowest ΔHvap
N
2
, CO, CO
2
N
2
Lowest vapor pressure
CH
4
, CH
3
CH
3
, CH
3
CH
2
CH
3
CH
3
CH
2
CH
3
Highest BP
HF, HCl, HBr
HF

Lowest VP
F
2
, Cl
2
, Br
2
, I
2
I
2
Solid at room temp
KCl, HF, NH
3
, Cl
2
, H
2
O
KCl
Knowing that ΔH vap
for water is 40.7kJ/mol, calculate the vapor pressure of water at 56.0˚C
VP=0.173atm or 131Torr
A solution of sodium nitrate has a concentration of 0.733M. It has a density of
1.039g/mL. molality? 0.751m
% by mass?
Mole fraction NaNO
3
6.0%
? 0.0133
Mole fraction H
2
O? 0.987