Chemistry Unit 2

Low vapor pressure

High boiling point = _____ vapor pressure

High BP, Low VP

Strong intermolecular forces = ___ bp, ____ vp

Low BP, High VP

Weak intermolecular forces= ____ bp, ____ vp

Higher boiling point, higher viscosity

Large molecules = _____ bp, ____ viscosity

Higher boiling point, lower vapor pressure

More hydrogen bonding = ____ BP, _____ VP

High boiling point, high melting point

Ionic bonds = _____ BP, ______ MP

Higher boiling point than nonpolar molecules of similar size

Polar molecules = ______ BP than nonpolar molecules of a smaller size

Low boiling point, high vapor pressure

Nonpolar molecules = ____ BP, ____ VP

Lower boiling point, higher vapor pressure

Small molecules = _____ BP, ____ VP

Higher boiling point, higher viscosity

More electrons (bigger atoms) = _____ BP, _____ viscosity

High boiling point, low vapor pressure

Hydrogen bonding = ____ BP, ____ VP

Moderate boiling point

Dipole-dipole interactions = ______ BP

Low boiling point, high vapor pressure

London dispersion forces = ____ BP, ____ VP

Higher boiling point

High molecular weight = ___ BP

Higher boiling point (larger molecules)

Polarizability = _____ BP, _____ sized molecules

Strong intermolecular forces

High viscosity = _____ IMF

High boiling point, high melting point

Strong ionic bonds = ___ BP, ____ MP

LDF (Nonpolar) <Dipole Dipole (Polar) <Hydrogen Bonding<Ionic

Rank the Strength of Intermolecular Forces (Weakest to strongest)

F, O, N

All possible hydrogen bonds

H₂O has a higher boiling point (stronger hydrogen bonds)

H₂O vs. H₂S = Boiling Point

C₆H₆ has a higher boiling point (larger, more electrons)

CH₄ vs. C₆H₆ = Boiling Point

NH₃ has a higher boiling point (hydrogen bonding)

NH₃ vs. PH₃ = Boiling Point

NaCl has a higher boiling point (ionic bonds vs. dispersion)

NaCl vs. CH₄ = Boiling Point

SO₂ has a higher boiling point (polar, dipole-dipole forces)

CO₂ vs. SO₂ = Boiling Point

LDF Noble gas

Ar (IMF)

Dipole, LD

HCl

Hydrogen bonding, LD

HF

ionic

CaCl2

LD

CH4

dipole, LD

CO

ionic

NaNO3