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IB Chemistry HL 2.2.3 Factors affecting rate Question Bank

Practise IB Chemistry HL 2.2.3 by applying factors affecting rate to exam-style questions.

Syllabus
First assessment 2025
Course
Chemistry HL
Level
HL

Exam points

  • identify the relevant chemical structure, process or evidence
  • apply the correct chemical model or equation
  • evaluate the result using chemical reasoning and data

2.2.3—Factors affecting rate question 1

[Maximum number: 2]

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}

Typical conditions used in the Haber process are 500∘C500^{\circ} \mathrm{C} and 200 atm , resulting in approximately 15 % yield of ammonia.

Explain why a temperature lower than 500∘C500^{\circ} \mathrm{C} is not used.

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