IB Chemistry HL 3.4.7 Coordination Bond Formation Questions

Use real HL exam questions to identify ligands and Lewis-acid centres, then explain the dative bond formed by electron-pair donation.

Exam points

Identify the ligand or Lewis base that supplies both electrons in the shared pair of a coordination bond.
Identify the Lewis-acid central atom or ion that accepts the donated pair to form the coordination bond.
Explain or represent coordination-bond formation as lone-pair donation from the ligand to the accepting centre, including polydentate cases.

[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.

Describe the bond formation when urea acts as a ligand in a transition metal complex ion.

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