Multiple Choice
Which of the following properties indicates the presence of weak intermolecular forces in a liquid?
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13. Liquids, Solids & Intermolecular Forces
Intermolecular Forces
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Which of the following substances exhibits only London (dispersion) forces?
A
HCl (hydrogen chloride)
B
NH3 (ammonia)
C
CH3OH (methanol)
D
Ne (neon)
Verified step by step guidance1
Identify the types of intermolecular forces present in each substance. Intermolecular forces include London dispersion forces, dipole-dipole interactions, and hydrogen bonding.
Recognize that London dispersion forces are present in all molecules but are the only forces in nonpolar atoms or molecules without permanent dipoles or hydrogen bonding.
Analyze each substance: HCl is polar and has dipole-dipole forces; NH3 has hydrogen bonding due to N-H bonds; CH3OH has hydrogen bonding due to O-H bonds.
Neon (Ne) is a noble gas atom, nonpolar, and monatomic, so it exhibits only London dispersion forces with no dipole-dipole or hydrogen bonding.
Conclude that among the given options, only Ne exhibits exclusively London (dispersion) forces.
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