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IB Chemistry HL 2.2.14 Hl Formal Charge Questions

Calculate formal charge from valence, nonbonding and shared electrons, then compare valid Lewis formulas by charge separation, octet completion and the lowest-charge model.

Syllabus
First assessment 2025
Course
Chemistry HL
Level
HL

Exam points

  • Calculate formal charge for each atom from valence electrons, nonbonding electrons and the bonding-electron share.
  • Construct or annotate valid Lewis formulas with the correct non-zero formal charges and complete octets where applicable.
  • Compare valid Lewis structures and select the preferred contributor using charge separation, charge magnitude and octet completion.

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Study 2.2.14 (HL)—Formal charge conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Chemistry HL 2.2.14 Hl Formal Charge Questions question 1

[Maximum number: 1]

Sulfur trioxide is an important compound in industry.

Sulfur trioxide has more than one possible Lewis (electron dot) structure.

State how chemists decide which Lewis (electron dot) structure is more stable.

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