IB Chemistry HL 2.2.5 Bond Polarity Questions
Use exam questions to classify polar bonds, compare electronegativity differences and annotate δ+ and δ− dipoles in structural formulas.
- Syllabus
- First assessment 2025
- Course
- Chemistry HL
- Level
- HL
Exam points
- Compare electronegativity values or differences to classify a covalent bond as non-polar or polar and justify the classification.
- Assign δ+ to the less electronegative atom and δ− to the more electronegative atom in a polar bond.
- Annotate a structural formula with bond-dipole direction and partial charges for each relevant polar bond.
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IB Chemistry HL 2.2.5 Bond Polarity Questions question 1
Phosphine (IUPAC name phosphane) is a hydride of phosphorus, with the formula .
Outline whether you expect the bonds in phosphine to be polar or non-polar, giving a brief reason.
Phosphine has a much greater molar mass than ammonia. Explain why phosphine has a significantly lower boiling point than ammonia.
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