Inter Molecular Forces

A. List the types of intermolecular forces that exist between the molecules:


(a) Benzene (C6H6) molecules are nonpolar. Only dispersion forces will be present.

(b) Chloroform (CH3Cl) molecules are polar (why?). Dispersion and dipole-dipole forces will be present.

(c) Phosphorus trifluoride (PF3) molecules are polar. Dispersion and dipole-dipole forces will be present.

(d) Sodium chloride (NaCl) is an ionic compound. Ion-ion and dispersion forces will be present.

(e) Carbon disulfide (CS2) molecules are nonpolar. Only dispersion forces will be present.


1: PCl5 : Dispersion

2. CS2: Dispersion

3: CH3CH2OH: Dispersion, Dipole-Dipole, Hydrogen

4 SF4: Dispersion, Dipole-Dipole



B. Which has the strongest intermolecular forces of attraction?



1. CH3CH2OH or CH3CH2Br

I chose:CH3CH2OH



2. SI4 or CI4

I chose Sulfur Tetraiodide



C. Which has the lowest boiling point?



1. CH3CH2Cl or CH3CH2OH

I chose: CH3CH2Cl



2. NH3 or PH3

I chose: NH3



D. Which has the highest vapor pressure?



1. CH3Br or CH3Cl

I chose: CH3Cl



2. F2 or HCl

I chose: F2