Multiple Choice
Which of the following is the strongest intermolecular force present between two molecules of water (H_2O)?
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13. Liquids, Solids & Intermolecular Forces
Intermolecular Forces
Multiple Choice
Which type(s) of intermolecular forces are expected between NH_3 molecules?
A
Only London dispersion forces
B
Hydrogen bonding and London dispersion forces
C
Dipole-dipole forces and London dispersion forces, but not hydrogen bonding
D
Only dipole-dipole forces
Verified step by step guidance1
Identify the types of intermolecular forces that can exist between molecules. The main types are London dispersion forces, dipole-dipole interactions, and hydrogen bonding.
Examine the molecular structure of NH_3 (ammonia). It has a nitrogen atom bonded to three hydrogen atoms, and nitrogen is highly electronegative, creating a polar molecule with a significant dipole moment.
Determine if hydrogen bonding is possible. Hydrogen bonding occurs when hydrogen is directly bonded to highly electronegative atoms like nitrogen, oxygen, or fluorine. Since NH_3 has N-H bonds, hydrogen bonding can occur between NH_3 molecules.
Recognize that all molecules exhibit London dispersion forces due to temporary fluctuations in electron density, so NH_3 molecules will also have London dispersion forces.
Conclude that NH_3 molecules exhibit both hydrogen bonding and London dispersion forces as their intermolecular forces.
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