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IB Chemistry HL 2.2.1 Covalent Bonding Questions

Use exam questions to describe shared-electron covalent bonds, count valence electrons and draw octet-respecting Lewis formulas.

Syllabus
First assessment 2025
Course
Chemistry HL
Level
HL

Exam points

  • Describe a covalent bond as electrostatic attraction between a shared electron pair and the positively charged nuclei of the bonded atoms.
  • Count valence electrons before placing bonding pairs, lone pairs and any overall ionic charge in a Lewis representation.
  • Draw a Lewis formula with single, double or triple bonds and lone pairs so each relevant atom reaches the octet rule (or the stated incomplete-octet exception).

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Study 2.2.1—Covalent bonding conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Chemistry HL 2.2.1 Covalent Bonding Questions question 1

[Maximum number: 1]

Phosphine (IUPAC name phosphane) is a hydride of phosphorus, with the formula PH3\mathrm{PH}_{3}.

Draw a Lewis (electron dot) structure of phosphine.

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