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MSH Practical Laboratory Series
Lab 5: Effect of Concentration on Rate of Reaction
Cambridge IGCSE Chemistry 0620
Printable Student Worksheet
Paper 5 / Paper 6 Skills
Topic: 6.2 Rate of Reaction | Student printable version
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Aim

To complete a practical investigation linked to 6.2 Rate of Reaction and develop IGCSE practical skills in observation, measurement, recording, analysis and evaluation.

Learning Objectives

Apparatus and Chemicals

Safety:

Risk Assessment Summary

Possible hazardSafety precautionEmergency response
Chemicals may irritate skin or eyes.Wear eye protection; avoid direct contact; use small quantities.Rinse affected area with plenty of water and inform the teacher.
Glassware, hot apparatus or flames may cause injury.Handle apparatus carefully; use test-tube holders; keep bags away from benches.Report breakages, burns or spills immediately.

Paper 5 / Paper 6 Practical Skills Checklist

I selected and used suitable apparatus safely.
I recorded observations and measurements clearly.
I used correct units and table headings.
I identified variables where appropriate.
I processed data or drew conclusions from evidence.
I evaluated the method and suggested improvements.

Method

  1. Measure a fixed volume of hydrochloric acid.
  2. Add a fixed mass of calcium carbonate chips.
  3. Start timing immediately.
  4. Record gas volume every 20 seconds or record mass loss over time.
  5. Repeat using different acid concentrations.
  6. Keep mass, volume, chip size and temperature constant.
  7. Plot results and compare rates.

Results

Concentration / mol dm⁻³Time / sGas volume / cm³ or mass / g

Additional observations:

Analysis Questions

  1. Identify the independent variable.
  2. Identify the dependent variable.
  3. Name two controlled variables.
  4. How does concentration affect rate?
  5. Explain the trend using collision theory.

Claim-Evidence-Reasoning (CER)

Claim: What happened?Evidence: What data/observations support this?Reasoning: What chemistry explains it?

Conclusion

Use your data to conclude how concentration affects the rate of reaction.

Evaluation

Identify one source of error and one improvement to the method.

Source of errorImprovement

Extension / Challenge

Draw a graph and use the steepness of the curve to compare reaction rates.

Teacher Assessment (30 Marks Total)

CriterionMarks
Planning & Organisation5
Data Collection & Observations5
Processing & Analysis10
Evaluation & Improvements5
Conclusion5
Total30

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