6-4 Intermolecular Attractions

what two types of attractions make up van der Waals forces?

dispersion forces and dipole interactions

______ forces and ______ interactions are called _____

dispersion, dipole, van der Waals forces

what causes dispersion forces?

motion of electrons

electron motion results in _____

temporary uneven charges

what causes stronger London dispersion forces?

increase in number of electrons

when there are more electrons, the _____ becomes___

electron cloud, easier to polarize

____ molecules have ____ _____ and ___ ends

polar, permanent, positive, negative

dipole interactions tend to be _____ than ____

stronger, dispersion forces

what elements can hydrogen atom form hydrogen bond IMF with?

fluorine, nitrogen, oxygen

what type of intermolecular force is the strongest?

hydrogen bonds

are hydrogen bonds really “bonds?”

no

what 3 properties of elements depend on intermolecular forces?

melting point, boiling point, and volatility

what is volatility?

measure of how easy a liquid evaprates

if a liquid is more volatile, then that means…

more molecules are in gas phase above the liquid

out of ionic, molecular, and metallic, what kind of substances are weakest?

molecular

out of Cl, Br, and I, what element has the highest boiling/melting point?

iodine

larger molecules have….

larger LDFs