Questions: Type the following formulas in the boxes below in order of increasing boiling point: ZnS, CO2, CH3CH2OH, CH-Br.

Solution Steps

To determine the boiling points, we need to identify the types of intermolecular forces present in each compound:

• $\mathrm{ZnS}$: Ionic bonds
• $\mathrm{CO}_{2}$: London dispersion forces (nonpolar molecule)
• $\mathrm{CH}_{3}\mathrm{CH}_{2}\mathrm{OH}$: Hydrogen bonding (polar molecule with -OH group)
• $\mathrm{CH}_{3}\mathrm{Br}$: Dipole-dipole interactions (polar molecule)

The strength of intermolecular forces generally increases in the following order:

1. London dispersion forces
2. Dipole-dipole interactions
3. Hydrogen bonding
4. Ionic bonds

Based on the strength of the intermolecular forces:

1. $\mathrm{CO}_{2}$ (London dispersion forces)
2. $\mathrm{CH}_{3}\mathrm{Br}$ (Dipole-dipole interactions)
3. $\mathrm{CH}_{3}\mathrm{CH}_{2}\mathrm{OH}$ (Hydrogen bonding)
4. $\mathrm{ZnS}$ (Ionic bonds)

Final Answer