OCR A Level Chemistry A
OCR A Level Chemistry A Reaction Rates and Equilibrium Exam Questions
Free OCR A Level Chemistry A exam questions on Reaction Rates and Equilibrium, with mark schemes. Covers collision theory, catalysts, Boltzmann distributions, dynamic equilibrium, Le Chatelier and Kc.
Reaction Rates and Equilibrium exam questions
1 question pack of real past exam questions with its mark scheme. Answer every question without notes, then mark your answers line by line against the mark scheme.
StemUp mark scheme flashcards
OCR A Level Chemistry A H432 Flashcards (Anki & Quizlet)
Every answer is written in mark scheme wording, so you learn exactly what examiners give marks for. Use them on Anki or Quizlet, then test yourself with the questions on this page.
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About OCR A Level Chemistry A Reaction Rates and Equilibrium
This topic covers rates and equilibrium.
What you need to know
- Collision theory Concentration, pressure and temperature effects.
- Boltzmann distribution Explaining temperature and catalyst effects.
- Equilibrium Le Chatelier's principle.
- Kc Writing and calculating Kc.
Common mistakes in Reaction Rates and Equilibrium
- Saying catalysts shift equilibrium.
- Mislabelling Boltzmann axes.
- Forgetting Kc changes only with temperature.
Try three Reaction Rates and Equilibrium exam-style questions
1. Explain how a catalyst increases rate. (2 marks)
Show the mark scheme answer
Provides an alternative route with lower activation energy (1), so more particles have enough energy (1).
2. State the effect of increasing pressure on N₂ + 3H₂ ⇌ 2NH₃. (1 mark)
Show the mark scheme answer
Equilibrium shifts right.
3. Define dynamic equilibrium. (1 mark)
Show the mark scheme answer
Forward and reverse rates are equal and concentrations constant.
Reaction Rates and Equilibrium FAQs
What does this topic cover?
Rates, Boltzmann distributions and equilibrium.
Which practical links here?
Measuring reaction rates.
Why does temperature affect rate so much?
Many more particles exceed activation energy.
Revise this topic with flashcards: OCR A Level Chemistry A H432 Flashcards, with mark scheme answers for Anki and Quizlet.
