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Practice · Chemistry · 2025 syllabus · R2.2

IB Chemistry R2.2 How fast? The rate of chemical change: practice questions

14 exam-style questions on R2.2 How fast? The rate of chemical change, SL and HL, 8 marked HL: 8 multiple choice, 2 data-based and 4 structured. Each one comes with the mark scheme, a model answer and the reasoning behind every mark. Free with your email.

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R2.2-01 · Paper 1A style · multiple choice · 1 mark

Units of a rate

Which could be the unit of a rate of reaction? [1]

  1. mol dm−3
  2. mol dm−3 s
  3. mol dm−3 min−1
  4. dm3 mol−1 s−1
Show the answer and the reasoning

Answer: C. C is correct. Rate is a change in concentration per unit time: concentration unit divided by a time unit. A is a concentration with no time. B multiplies by time instead of dividing; 53 % of candidates chose this form in May 2025. D is a unit of a rate constant (second order), not of a rate.

The other 13 open with your email, with the same mark scheme and reasoning.

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The 14 questions in R2.2

  1. R2.2-01 Units of a ratePaper 1A style · multiple choice · 1 mark
  2. R2.2-02 What speeds up a reactionPaper 1A style · multiple choice · 1 mark
  3. R2.2-03 Maxwell–Boltzmann at lower temperaturePaper 1A style · multiple choice · 1 mark
  4. R2.2-04 Intermediate or catalystPaper 1A style · multiple choice · 1 mark · HL
  5. R2.2-05 Orders from initial ratesPaper 1A style · multiple choice · 1 mark · HL
  6. R2.2-06 Units of a rate constantPaper 1A style · multiple choice · 1 mark · HL
  7. R2.2-07 Rate equation from a mechanismPaper 1A style · multiple choice · 1 mark · HL
  8. R2.2-08 Activation energy from a slopePaper 1A style · multiple choice · 1 mark · HL
  9. R2.2-09 Rate from a reaction timePaper 1B style · data-based · 7 marks
  10. R2.2-10 Initial rate from a tangentPaper 1B style · data-based · 6 marks
  11. R2.2-11 Temperature, catalysts and collisionsPaper 2 style · structured question · 5 marks
  12. R2.2-12 Rate equation and k from dataPaper 2 style · structured question · 5 marks · HL
  13. R2.2-13 A two-step mechanismPaper 2 style · structured question · 7 marks · HL
  14. R2.2-14 Activation energy by the Arrhenius plotPaper 2 style · structured question · 5 marks · HL

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Every Biology and Chemistry question here is original, written for practice in the style of the papers set since the 2025 syllabus, with invented data. Developed independently from the International Baccalaureate Organization, which has not endorsed it. Found a mistake? Email vytis@limeadmissions.com with the question id.