Identify the most important types of interparticle forces present in the solids of each of the following substances. a. Ar e. \(\mathrm{CH}_{4}\) b. \(\mathrm{HCl}\) f. \(\mathrm{CO}\) c. HF g. \(\mathrm{NaNO}_{3}\) d. \(\mathrm{CaCl}_{2}\)

To identify the most important type of interparticle force, we need to first evaluate the type of bonding present in each substance. a. Ar: Noble gas - Van der Waals forces (specifically, London dispersion forces) e. \(\mathrm{CH}_{4}\): Non-polar covalent molecules - Van der Waals forces (specifically, London dispersion forces) b. \(\mathrm{HCl}\): Polar covalent molecules - Van der Waals forces (specifically, dipole-dipole attractions) f. \(\mathrm{CO}\): Polar covalent molecules - Van der Waals forces (specifically, dipole-dipole attractions) c. HF: Polar covalent molecules with hydrogen bond donor and acceptor - Hydrogen bonds g. \(\mathrm{NaNO}_{3}\): Ionic compound - Ionic bonds d. \(\mathrm{CaCl}_{2}\): Ionic compound - Ionic bonds

Based on the bonding identified in each substance, we can now list the most important type of interparticle forces present in their solid forms. a. Ar: London dispersion forces e. \(\mathrm{CH}_{4}\): London dispersion forces b. \(\mathrm{HCl}\): Dipole-dipole attractions f. \(\mathrm{CO}\): Dipole-dipole attractions c. HF: Hydrogen bonds g. \(\mathrm{NaNO}_{3}\): Ionic bonds d. \(\mathrm{CaCl}_{2}\): Ionic bonds