IB Chemistry HL 2.2.8 Intermolecular Forces Imf Questions

Use exam questions to identify intermolecular forces from polarity and functional groups, compare London-force strength 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: 2]

Urea, $\left(\mathrm{H}_{2} \mathrm{~N}\right)_{2} \mathrm{CO}$ , is excreted by mammals and can be used as a fertilizer.

Sketch two different hydrogen bonding interactions between ammonia and water.

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