Multiple Choice
Which type of intermolecular force is generally considered the weakest?
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13. Liquids, Solids & Intermolecular Forces
Intermolecular Forces
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Which of the following molecules exhibits only London (dispersion) forces?
A
CH_3Cl
B
NH_3
C
H_2O
D
N_2
Verified step by step guidance1
Identify the types of intermolecular forces present in each molecule by considering their polarity and molecular structure.
Recall that London dispersion forces are present in all molecules but are the only intermolecular forces in nonpolar molecules.
Analyze each molecule: CH_3Cl is polar due to the electronegativity difference between C, H, and Cl, so it has dipole-dipole forces in addition to London forces.
NH_3 and H_2O are polar and also exhibit hydrogen bonding because they contain N-H and O-H bonds, respectively, which are strong dipole-dipole interactions.
N_2 is a nonpolar diatomic molecule with no permanent dipole moment, so it exhibits only London (dispersion) forces.
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