attractive forces that have an impact on boiling and melting points

dispersion force (what type of compounds exhibit this force)

all molecular compounds

dispersion force (strength)

weak, bp and mp increases as the size of the molecules increases.

dipole-dipole (what type of compounds exhibit this force)

molecular compounds that contain polar bonds

dipole-dipole (strength)

weak, stronger than dispersion, increases both boiling and melting points because it creates stronger intermolecular forces between polar molecules… such as compounds with oxygen and nitrogen atoms because these elements have high electronegativity

hydrogen bond (what type of compounds exhibit this force)

molecular compounds that contain O - H  or         N - H   groups

Hydrogen bonding increases the boiling and melting points of a substance because it requires more energy to break the strong intermolecular forces that hydrogen bonds create

hydrogen bonding (strength)

a weak attraction between a positively charged H atoms and a negatively charged O or N atoms

2 water: O - H polar covalent bonds will create an H-bond

ion-ion (what type of compounds exhibit this force)

oppositively charged ions ( all ionic compounds)

ion-ion attraction (strength)

Very strong (ionic compounds, between metals and non-metals) have very high melting and boiling points)