Chapter 1: Rate Equations and Rate-Determining Step

A-level ChemistryModule 5: Physical Chemistry & Transition Elements8 topicsHigher

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Releases 1 August 2026

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Module 5: Physical Chemistry and Transition Elements: Rate Equations and Rate-Determining Step - Authored Long Answer Questions

Examiner-style long-answer practice with automatic marking, improvement advice and ProofCoach tracking.

4 questions25 marks37.5 min

standard / hard

6 marksdescribestandardOCR A

For Rate Equations and Rate-Determining Step, describe how rate equations, order and rate-determining steps applies to iodine clock initial-rate experiment.

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6 markscalculatehardOCR A

Using iodine clock initial-rate experiment, calculate a relevant OCR A Rate Equations and Rate-Determining Step quantity and explain the physical or chemical meaning of the answer. Show equation, substitution, answer and unit.

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7 marksexplainhardOCR A

Rate Equations and Rate-Determining Step: Concentration of reactant A (mol dm-3) vs Initial rate (mol dm-3 s-1)

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The graph for Rate Equations and Rate-Determining Step shows data from iodine clock initial-rate experiment. Explain the pattern using the data and relevant chemistry principles.

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6 marksevaluatestandardOCR A

In iodine clock initial-rate experiment, evaluate the experimental method or model assumptions used when applying rate equations, order and rate-determining steps.

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Start of Module 5: Physical Chemistry & Transition Elements

2. Equilibrium, Kc, Kp and Industrial Compromise

Key learning objectives

Understand the key principles behind Rate Equations and Rate-Determining Step.
Apply these ideas to exam-style questions.
Recall the essential definitions and key terms.