Question

Identify the strongest attractive forces between the particles of each of the following. (Dipole-dipole attraction, Ionic bonding, Dispersion forces, Hydrogen bonding)

CH2Cl2 CH3COOH SiH4 O2 H2O HBr OBr2 CHCl3 IBr LiCl

Answer 1

Note that ALL matter will experience dispersion fores, so inlcude those on all of them...

dipole-dipole = only via polar molecules

Ionic bonding = only metal + nonmetal species

H-bonding = H bonded to F,O,N

then:

CH2Cl2 --> polar, therefore dipole-dipole

CH3COOH --> polar, therefore dipole-dipole; also, there are hydrogens present, so there is hydrogen bonding

SiH4 --> nonpolar, therefore only dispersion forces (major force)

O2 -->  nonpolar, therefore only dispersion forces (major force)

H2O --> polar, therefore dipole-dipole; also, there are hydrogens present, so there is hydrogen bonding

HBr -->  polar, therefore dipole-dipole

OBr2 --> polar, therefore dipole-dipole

CHCl3 --> polar, therefore dipole-dipole

IBr --> polar, therefore dipole-dipole

LiCl -> metal + nonmetal, thi is an ionic bonding