Choose the predominant intermolecular force involved for each substance.

Question

Choices (London dispersion, Dipole-dipole, Hydrogen Bond, Covalent Network, Ionic Forces)

Pair 1: HCl

Pair 1: I2

Pair 2: CH3F

Pair 2: CH3OH

Pair 3: H2O

Pair 3: H2S

Pair 4: SiO2

Pair 4: SO2

Answer 1

1) For H-bonding, you need a N,O,or F attached to an H (you have weak H-bonding with S in biological systems important for protein shape) There are 2

2) dip-dip happens with polar molecules (You need polar bonds (EN difference > .4) AND an asymmetry in shape or attachments)

All VSEPR fundamental shapes with the same attachments are symmetrical and nonpolar. There are 4 that are not H-bonding.

3) Nonpolar molecules require London Dispersion forces. SiO₂ is weird because it is a network solid and forms a nonpolar structure (sand doesn't dissolve in water) There are 2