IB Chemistry HL 2.2.4 VSEPR Model Question Bank

Practise IB Chemistry HL 2.2.4 by applying VSEPR to four-domain structures, comparing electron and molecular geometry and judging lone-pair angle effects.

Exam points

count bonding and lone-pair domains around the central atom from a Lewis structure
name electron-domain and molecular geometries separately when lone pairs are present
predict how lone-pair repulsion changes a bond angle from the ideal geometry

[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.

Figure for Question 2.2.4—VSEPR model question 1 — IB Chemistry HL

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

Table for Question 2.2.4—VSEPR model question 1 — IB Chemistry HL

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2.2.4—VSEPR model question 1