Question

Classify each of the following forces as intermolecular or intramolecular. Those preventing O2 in air from forming O atoms Those allowing fog to form on a cool, humid evening Those preventing oil from evaporating at room temperature Those responsible for the low boiling point of hexane Those preventing butter from melting in a refrigerator

Answer 1

Answer: Those preventing $O_2$ in air from forming O atoms : Intramolecular

Those allowing fog to form on a cool, humid evening : Intermolecular

Those responsible for the low boiling point of hexane : Intermolecular

Those preventing butter from melting in a refrigerator :  Intermolecular

Explanation:

Intermolecular forces are forces which exist within different molecules. Example: Forces between water and salt

Intramolecular forces are forces which exist within the same molecules. Example: forces within water

a) When oxygen is dissociated to form atoms , the bonds between the oxygen atoms is broken and hence the forces are intramolecular.

b) Those allowing fog to form on a cool, humid evening : strong interactions between the molecules cause the gaseous water molecules to condense and hence is intermolecular

c) Those responsible for the low boiling point of hexane : the weak dispersion forces among the molecules of hexane are responsible and hence is intermolecular.

d)  Those preventing butter from melting in a refrigerator : The attractions between the fat molecules are broken and hence is  intermolecular.