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Rates of Reaction
Practice Questions

20 CXC CSEC Chemistry questions on Rates of Reaction, each with instant feedback and a full examiner-style mark scheme.

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Try 2 sample questions on Rates of Reaction

Question 1 · 1 mark · Difficulty 1/3

A student investigating the rate of reaction between marble chips and dilute hydrochloric acid measured the volume of carbon dioxide gas produced every 30 seconds. Which piece of apparatus would be MOST suitable for collecting and measuring the gas?

  1. A gas syringe
  2. A burette
  3. A measuring cylinder inverted over water
  4. A conical flask with cotton wool
Show answer & explanation
✓ Answer: AA gas syringe
Award 1 mark for selecting A. A gas syringe allows accurate, continuous measurement of gas volume at timed intervals. B is incorrect — burettes are designed for liquid volume measurement, not gas collection. C (inverted measuring cylinder) can collect gas but requires water displacement and is less convenient for timed measurements. D is incorrect — cotton wool in the flask allows gas to escape and prevents measurement.
Question 2 · 1 mark · Difficulty 2/3

In Trinidad, limestone (calcium carbonate) is quarried and reacts with hydrochloric acid according to the equation: CaCO₃(s) + 2HCl(aq) → CaCl₂(aq) + H₂O(l) + CO₂(g). A student used 50 cm³ of 2.0 mol/dm³ HCl and excess limestone chips. How many moles of HCl were used?

  1. 0.025 mol
  2. 0.05 mol
  3. 0.10 mol
  4. 0.20 mol
Show answer & explanation
✓ Answer: C0.10 mol
10 mol. Award 1 mark for C. Number of moles = concentration × volume (in dm³). Moles = 2.0 mol/dm³ × (50/1000) dm³ = 2.0 × 0.05 = 0.10 mol. A is incorrect — divides by 2 incorrectly. B is incorrect — uses concentration of 1.0 instead of 2.0. D is incorrect — multiplies instead of converting cm³ to dm³.
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CXC CSEC Chemistry: Rates of Reaction FAQ

How many CXC CSEC Chemistry questions on Rates of Reaction are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on Rates of Reaction for CXC CSEC Chemistry, with new questions added every week. Each question gives you instant feedback and a full examiner-style mark scheme that tells you exactly what would earn marks on a real CXC paper. The questions span the full difficulty range — from straightforward recall (level 1) right up to multi-step reasoning and evaluation (level 3) — so the bank works for first-pass revision and final exam-week stress testing alike.
Is Kramizo free for CXC CSEC students preparing for Chemistry?
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 Rates of Reaction practice with other Chemistry topics or even switch to a totally different CXC 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 Rates of Reaction questions aligned to the official CXC CSEC Chemistry syllabus?
Every question is written against the published CXC CSEC Chemistry specification, including the exact command words (state, describe, explain, calculate, evaluate, etc.), mark allocations, and difficulty tier you'd see on a real CXC 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 CXC.
How is Rates of Reaction typically tested on CXC CSEC Chemistry papers?
Rates of Reaction appears across multiple question types on real CXC CSEC Chemistry 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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