ConceptConceptDocsDocuments

IB Chemistry HL 2.2.11 Resonance Structures Question Bank

Practise IB Chemistry HL 2.2.11 by drawing resonance contributors and explaining delocalization, equivalent bonds and intermediate bond lengths.

Syllabus
First assessment 2025
Course
Chemistry HL
Level
HL

Exam points

  • draw valid resonance contributors by relocating π electrons while keeping the atomic framework fixed
  • explain equivalent or intermediate bond lengths using delocalization rather than rapidly alternating structures
  • identify resonance and conjugation in ozone, carboxylate, aromatic and related structures and apply it to bond-length predictions

2.2.11 (HL)—Resonance structures question 1

[Maximum number: 1]

Urea, (H2 N)2CO\left(\mathrm{H}_{2} \mathrm{~N}\right)_{2} \mathrm{CO}, is excreted by mammals and can be used as a fertilizer.

The C-N bonds in urea are shorter than might be expected for a single C-N bond. Suggest, in terms of electrons, how this could occur.

All question bank results loaded