IB Chemistry SL 2.2.8 Intermolecular Forces Imf Questions

Use exam questions to identify intermolecular forces from polarity and functional groups, compare London forces and draw hydrogen bonds.

Exam points

Deduce the intermolecular forces present from molecular polarity, functional groups and the ability of a donor or acceptor to interact.
Compare London-force strength using electron count, molecular size, polarizability and contact surface, linking the result to volatility or boiling point.
Draw or interpret a hydrogen bond from an O–H or N–H donor to a valid lone-pair acceptor and distinguish it from covalent bonding.

[Maximum number: 1]

Ethyne, $\mathrm{C}_{2} \mathrm{H}_{2}$ , reacts with oxygen in welding torches.

Identify the type of interaction that must be overcome when liquid ethyne vaporizes.

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