Exam 3 Intermolecular Forces + Formal Charges

dispersion

all atoms and molecules

dispersion appearance

dispersion strength

¼ (weakest)

dipole-dipole

polar molecules

dipole-dipole appearance

dipole-dipole strength

2/4 (weak)

hydrogen bond

molecules of H bonded to F, O, N

(highly electronegative elements)

hydrogen bond appearance

hydrogen bond strength

¾ (strong)

ion-dipole

mixtures of ionic compounds and polar compounds

ion-dipole appearance

ion-dipole strength

4/4 (strongest)

ionic compounds

metal + nonmetal, transfer of electrons

covalent compound

nonmetal + nonmetal, sharing of electrons

polar compound

nonmetal + nonmetal, unequal sharing of electrons

non-polar compound

nonmetal + nonmetal, equal sharing of electrons

formal charge

valence electrons - (bonds+dots)

one bond

one formal charge number

pair of dots

two formal charge number