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IB Chemistry HL 3.4.6 Lewis Acid Base Theory Questions

Use real HL exam questions to distinguish Lewis acids from Lewis bases, identify lone-pair donation and apply the classification to reactions and complex ions.

Syllabus
First assessment 2025
Course
Chemistry HL
Level
HL

Exam points

  • Define and classify Lewis acids as electron-pair acceptors and Lewis bases as electron-pair donors, distinguishing them from Brønsted–Lowry definitions.
  • Identify the specific electron pair or lone pair and the electron-deficient atom or species that accepts it in a Lewis acid-base example.
  • Relate nucleophiles to Lewis bases and electrophiles to Lewis acids in a stated reaction or complex-ion context, identifying each role.

Learn this topic

Study 3.4.6—Lewis acid-base theory conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Chemistry HL 3.4.6 Lewis Acid Base Theory Questions question 1

[Maximum number: 1]

When nitrogen gas and hydrogen gas are allowed to react in a closed container the following equilibrium is established.

N2( g)+3H2( g)⇌2NH3( g)ΔH=−92.6 kJ\mathrm{N}_{2}(\mathrm{~g})+3 \mathrm{H}_{2}(\mathrm{~g}) \rightleftharpoons 2 \mathrm{NH}_{3}(\mathrm{~g}) \quad \Delta H=-92.6 \mathrm{~kJ}

Define the term base according to the Lewis theory.

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