ap chem test thursday and friday

which of the following molecules has london dispersion forces as its only intermolecular forces

CH3CH3

which molecule has hydrogen bonding as the predominant intermolecular force

CH3OH because H is attached to an electronegatve element (F, N, or O)

which compound has the strongest intermolecular forces

CI4

the substance with the largest heat of vaporization is ......

I2

with what compound will NH3 experience only ion-dipole intermolecular forces

LiCl

octane C8H18 molecules are held together by ....

London dispersion forces

as a gaseous element condenses, the atoms become ______ and they have ______ attraction for one another

closer together; more

what types i=of intermolecular forces exist between NH3 and H2O

dispersion forces, dipole-dipole, hydrogen bonds

heat of sublmation can be approximated by adding together _____ and _____

heat of fusion; heat of vaporization

what intermolecular force is responsible for the fact that ice is less dense than liquid water

hydrogen bonding

when KBr dissolves in water, aqueous K+ and Br- ions result. the force of attraction that exists between K+ and H2O is called a _________ interaction

ion-dipole

elemental iodine (I2) is a solid at room temp. what is the major attractive force that exists among different I2 molecules in the solid

london dispersion forces

the strongest interparticle attractions exist between particles of a ______, and the weakest interparticle attractions exist between particles of a ___________

solid; gas

in liquids, the attractive intermolecular forces are...

strong enough to hold molecules relatively close together but NOT strong enough to keep molecules from moving past each other

_________ is the energy required to expand the surface area of a liquid by a unit amount of area

surface tension

in general, the vapor pressure of a substance increases as __________ increases

temperature

on a phase diagram, the melting point is the same as ______

the freezing point

how high a liquid will rise up a narrow tube as a result of capillary action depends on ....

the magnitudes of cohesive forces in the liquid and adhesive forces between the liquid and the tube and gravity