IB Chemistry HL 2.2.5 Bond Polarity Question Bank

Practise IB Chemistry HL 2.2.5 by calculating electronegativity differences, assigning partial charges and using bond dipoles to interpret molecular polarity.

Exam points

compare electronegativity values to classify a bond as non-polar or polar covalent
assign δ+ and δ− to the less and more electronegative atoms in a polar bond
annotate a structural formula with bond-dipole direction and partial charges

[Maximum number: 2]

Phosphine (IUPAC name phosphane) is a hydride of phosphorus, with the formula $\mathrm{PH}_{3}$ .

Outline whether you expect the bonds in phosphine to be polar or non-polar, giving a brief reason.

Figure for Question 2.2.5—Bond polarity question 1 — IB Chemistry HL

Phosphine has a much greater molar mass than ammonia. Explain why phosphine has a significantly lower boiling point than ammonia.

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2.2.5—Bond polarity question 1