WJEC A Level Chemistry
WJEC A Level Chemistry 2.2 Rates of Reaction Exam Questions
Free WJEC A Level Chemistry exam questions on 2.2 Rates of Reaction, with mark schemes. Covers collision theory, factors affecting rate, activation energy, catalysts and measuring rates.
2.2 Rates of Reaction 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.
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WJEC A Level Chemistry 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 WJEC A Level Chemistry 2.2 Rates of Reaction
This topic explains why reactions speed up or slow down. Expect Maxwell-Boltzmann diagrams.
What you need to know
- Collision theory Particles must collide with energy at least equal to the activation energy and correct orientation.
- Factors Concentration, pressure, surface area, temperature and catalysts.
- Maxwell-Boltzmann distribution Shows why a small temperature rise greatly increases the proportion of particles above Ea.
- Measuring rate Gas volume, mass loss, colour change and the gradient of a concentration-time graph.
Common mistakes in 2.2 Rates of Reaction
- Saying catalysts increase the energy of particles.
- Shifting the Maxwell-Boltzmann peak up with temperature.
- Forgetting orientation in collision theory.
Try three 2.2 Rates of Reaction exam-style questions
1. Explain how a catalyst increases rate. (2 marks)
Show the mark scheme answer
It provides an alternative route with lower activation energy (1), so more particles have enough energy to react (1).
2. Explain why increasing temperature increases rate. (2 marks)
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Particles have more kinetic energy, so more exceed Ea (1) and collide more often, giving more successful collisions per second (1).
3. State one way to measure rate for a reaction producing a gas. (1 mark)
Show the mark scheme answer
Collect the gas in a gas syringe and measure volume over time.
2.2 Rates of Reaction FAQs
What does Rates of Reaction cover?
Collision theory, factors affecting rate, the Maxwell-Boltzmann distribution and measuring rates.
Which practical links here?
Measuring the rate of a reaction by a gas collection or colour change method.
How is the topic extended later?
Chemical kinetics at A level adds rate equations and orders.
Revise this topic with flashcards: WJEC A Level Chemistry Flashcards, with mark scheme answers for Anki and Quizlet.
