Final answer:
The possible intermolecular forces of attraction that may be formed when the given compounds are mixed include London dispersion forces, hydrogen bonding, ion-dipole interactions, and dipole-dipole interactions.
Step-by-step explanation:
In the given compounds, the possible intermolecular forces of attraction that may be formed when these compounds are mixed are:
a. Hexane (C₆H₁₄) and heptane (C₇H₁₆): London dispersion forces. Both hexane and heptane are nonpolar compounds, so the only intermolecular force present is London dispersion forces.
b. Water and ethanol (C₂H₅OH): Hydrogen bonding. Both water and ethanol have hydrogen atoms bonded to highly electronegative atoms, which leads to the formation of hydrogen bonding.
c. Water and sodium chloride: Ion-dipole interactions. Sodium chloride is an ionic compound that dissociates into sodium ions and chloride ions in water. The water molecules then interact with the ions through ion-dipole interactions.
d. Water and formaldehyde (HCHO): Dipole-dipole interactions. Formaldehyde is a polar molecule due to the presence of a highly electronegative oxygen, and water is also a polar molecule. Hence, they can form dipole-dipole interactions.