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IB Chemistry HL 3.4.6 Lewis Acid–Base Theory Question Bank

Practise IB Chemistry HL 3.4.6 Lewis Acid–Base Theory with questions linking electron-rich and electron-poor species to reaction products.

Syllabus
First assessment 2025
Course
Chemistry HL
Level
HL

Exam points

  • classify the electron-pair donor as a Lewis base and the acceptor as a Lewis acid
  • identify the specific lone pair and electron-deficient atom involved in the interaction
  • connect nucleophiles with Lewis bases and electrophiles with Lewis acids in context

3.4.6—Lewis acid-base theory 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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