chm1046 CH 11 Flashcards
1
Q
IMF?
A
attractions between molecules (not within)
2
Q
4 types of IMF’S
A
- Diple - dipole
- London Dispersion / Van Der Waals
- Hydrogen bonds
- Ion - dipole
3
Q
Polar Molecules (shape)
A
asymmetrical
4
Q
Non-Polar Molecules (shape)
A
symmetrical
- Linear
- Triangular Planar
- Symmetry cancels out the charge*
5
Q
Dipole- Dipole IMF
A
- found w/ polar molecules (+/- end of molecule)
- Asymmetrical
6
Q
Van Der Waals
A
(LDF)
- non polar molecules
- weaker than dipole- dipole
- Found in ALL molecules (but are the exclusive IMF in non- polar molecules
7
Q
Ion - Dipole Forces
A
Occurs when molecules are in water
NaCl — H2O—> Na+ + Cl2-
* water attaches to the + and - Ions *
8
Q
Hydrogen Bonding
A
Very strong Once bonded to ;
- Fluorine
- Oxygen
- Nitrogen
- 3 most electronegative elements*
9
Q
Strength of London Dispersion Force depends on.. (3)
A
- Polarizability (vol. e- cloud ^, polarizability ^
- # Atoms (greater Molecular weight = stronger IMF)
- Geometry of molecule ( greater SA = stronger IMF)
10
Q
boiling point of a liquid
A
the temperature at which VP of liquid = the atmospheric pressure
11
Q
- Normal boiling point
A
Temp. of a liquid where VP= 1 atm
NB: H2O BP is only 100 at 1 atm
12
Q
BP relationship to IMF
A
directly proportional (stronger IMF = higher BP)
13
Q
IMF relationship to Vapor Pressure
A
Inversely proportional (strong IMF = v. little evaporation = Less VP
14
Q
Define VOLATILE
A
Ease of evaporation
weak IMF = volatile solution
15
Q
IMF & Surface Tension
A
directly proportional
