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IB Chemistry HL 2.2.1 Rate of Reaction Questions

Use real HL exam graphs and experiments to calculate average or initial rates and choose a measurable progress variable.

Syllabus
First assessment 2025
Course
Chemistry HL
Level
HL

Exam points

  • Choose a measurable variable such as concentration, mass, gas volume, pressure, colour, conductivity or pH and monitor its change with time.
  • Calculate average reaction rate from the gradient over a specified interval of a concentration, amount, mass or volume–time graph, with correct units.
  • Identify the initial or instantaneous rate from the tangent/initial gradient and state the rate units and sign convention clearly.

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Study 2.2.1—Rate of reaction conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Chemistry HL 2.2.1 Rate of Reaction Questions question 1

[Maximum number: 1]

The reaction between hydrogen and nitrogen monoxide is thought to proceed by the mechanism shown below.

2NO( g)⇌N2O2( g) fast equilibrium N2O2( g)+H2( g)→N2O( g)+H2O( g) slow reaction N2O( g)+H2( g)→N2( g)+H2O( g) fast reaction \begin{array}{ll} 2 \mathrm{NO}(\mathrm{~g}) \rightleftharpoons \mathrm{N}_{2} \mathrm{O}_{2}(\mathrm{~g}) & \text { fast equilibrium } \\ \mathrm{N}_{2} \mathrm{O}_{2}(\mathrm{~g})+\mathrm{H}_{2}(\mathrm{~g}) \rightarrow \mathrm{N}_{2} \mathrm{O}(\mathrm{~g})+\mathrm{H}_{2} \mathrm{O}(\mathrm{~g}) & \text { slow reaction } \\ \mathrm{N}_{2} \mathrm{O}(\mathrm{~g})+\mathrm{H}_{2}(\mathrm{~g}) \rightarrow \mathrm{N}_{2}(\mathrm{~g})+\mathrm{H}_{2} \mathrm{O}(\mathrm{~g}) & \text { fast reaction } \end{array}

Suggest how the rate of this reaction could be measured experimentally.

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