Chemistry: Intermolecular Forces & Properties Flashcards
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Read the first 7 Chemistry: Intermolecular Forces & Properties flashcards as text
Which arrangement lists intermolecular forces from weakest to strongest (typical)?
Answer: London < dipole-dipole < hydrogen bonding < ion-dipole
Generally London forces are weakest and ion-dipole forces are strongest among these.
A substance with a very high boiling point and brittle crystals that conducts when molten is best classified as:
Answer: Ionic solid
Ionic solids have strong electrostatic attractions, high melting points, and conduct when molten.
Which factor does NOT directly increase the strength of London dispersion forces?
Answer: A larger permanent dipole moment
Permanent dipole moment relates to dipole-dipole forces, not London dispersion forces.
Why do larger noble gases like xenon condense more easily than helium?
Answer: Stronger London dispersion forces
Xenon's many electrons make it highly polarizable, giving stronger dispersion forces than helium.
The meniscus of water in a glass tube is concave because:
Answer: Adhesion to glass exceeds cohesion
Water adheres to glass more strongly than it coheres to itself, curving the surface upward at edges.
Which liquid would evaporate fastest at the same temperature?
Answer: Diethyl ether (weak forces)
Diethyl ether has the weakest intermolecular forces, so it evaporates most readily.
Acetone (CH3COCH3) has dipole-dipole forces but no hydrogen bonding between its molecules because:
Answer: It has no H bonded to N, O, or F
Acetone's hydrogens are bonded to carbon, so it cannot donate hydrogen bonds despite being polar.