IB Chemistry HL 2.2.4 Vsepr Model Questions

Use exam questions to count electron domains, distinguish electron-domain from molecular geometry and explain bond angles using lone-pair repulsion.

Exam points

Count bonding and lone-pair electron domains around the central atom from the Lewis structure.
Name the electron-domain geometry and the molecular geometry separately when lone pairs are present.
Predict how lone-pair repulsion changes a bond angle from the ideal geometry and state the resulting shape/angle.

[Maximum number: 3]

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

The structural formula of urea is shown.

Predict the electron domain and molecular geometries at the nitrogen and carbon atoms, applying the VSEPR theory.

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