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AQA · GCSE · Combined Science (Trilogy)

Chemistry: The Rate and Extent of Chemical Change
Practice Questions

89 AQA GCSE Combined Science (Trilogy) questions on Chemistry: The Rate and Extent of Chemical Change, each with instant feedback and a full examiner-style mark scheme.

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✨ Revision guide includes key terms, worked examples and exam technique for Chemistry: The Rate and Extent of Chemical Change.

Try 2 sample questions on Chemistry: The Rate and Extent of Chemical Change

Question 1 · 1 mark · Difficulty 1/3

A catalyst is a substance that:

  1. Speeds up a reaction without being used up
  2. Slows reactions down
  3. Is used up in the reaction
  4. Changes the products
Show answer & explanation
✓ Answer: A — Speeds up a reaction without being used up
A catalyst increases the rate of reaction and is not used up, so it can be reused.
Question 2 · 1 mark · Difficulty 1/3

What does a catalyst do to the rate of a reaction?

  1. Increases it without being used up
  2. Decreases it
  3. Has no effect
  4. Increases it but is used up
Show answer & explanation
✓ Answer: A — Increases it without being used up
A catalyst speeds up a reaction by providing an alternative pathway with lower activation energy, and it is not used up in the process.
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20 questions · 25 min · free

AQA GCSE Combined Science (Trilogy): Chemistry: The Rate and Extent of Chemical Change FAQ

Is Kramizo free for AQA GCSE students preparing for Combined Science (Trilogy)?
Yes — completely free. Every student gets 45 questions a day on the free plan, with no card required and no trial countdown. That free quota works across every subject and every topic in our bank, so you can mix Chemistry: The Rate and Extent of Chemical Change practice with other Combined Science (Trilogy) topics or even switch to a totally different AQA subject without paying anything. Kramizo's optional Pro plan removes the daily cap and adds detailed progress analytics, but the free tier is the real product — used by thousands of GCSE, IGCSE and CSEC students.
Are the Chemistry: The Rate and Extent of Chemical Change questions aligned to the official AQA GCSE Combined Science (Trilogy) syllabus?
Every question is written against the published AQA GCSE Combined Science (Trilogy) specification, including the exact command words (state, describe, explain, calculate, evaluate, etc.), mark allocations, and difficulty tier you'd see on a real AQA paper. Explanations are written in the style of official examiner mark schemes — they tell you what is being awarded marks and why distractors are wrong, not just whether you got it right. The bank is continually refined to match the latest syllabus updates from AQA.
How is Chemistry: The Rate and Extent of Chemical Change typically tested on AQA GCSE Combined Science (Trilogy) papers?
Chemistry: The Rate and Extent of Chemical Change appears across multiple question types on real AQA GCSE Combined Science (Trilogy) papers — most commonly as multiple-choice questions in the objective section, structured short-answer questions in the main paper, and occasionally as part of an extended response. Kramizo's practice bank reflects that mix: 4-option MCQs, true/false statements, fill-in-the-blank key terms, multi-select questions, and ordering questions. Working through the bank gives you exposure to every question style examiners actually use.

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