IB skill practice

Explain resonance and formal charge in Lewis models

Paper 1, Paper 2 5 marks Difficulty 4

Electron count check for resonance model

A proposed resonance model in a organic structure seminar contains 24 valence electrons. The correct ion should contain 24 valence electrons. What electron-count verdict should be entered? Enter the answer and choose the interpretation that matches the HL chemistry evidence.

Worked practice: chemistry evidence and answer

Use the chemical evidence first, then enter the result and interpretation that match it.