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MSH Practical Laboratory Series
Lab 6: Exothermic and Endothermic Reactions
Cambridge IGCSE Chemistry 0620
Printable Student Worksheet
Paper 5 / Paper 6 Skills
Topic: 5.1 Chemical Energetics | Student printable version
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Aim

To complete a practical investigation linked to 5.1 Chemical Energetics 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 the starting temperature of the first reactant.
  2. Mix measured volumes or masses of reactants in an insulated cup.
  3. Stir gently and record the highest or lowest temperature reached.
  4. Calculate the temperature change.
  5. Repeat for the second reaction.
  6. Classify each reaction as exothermic or endothermic.

Results

ReactionStarting temperature / °CFinal temperature / °CTemperature change / °CExothermic or endothermic
Neutralisation
Dissolving solid

Additional observations:

Analysis Questions

  1. Which reaction released thermal energy?
  2. Which reaction absorbed thermal energy?
  3. Why is a polystyrene cup useful?
  4. How could heat loss affect the result?

Claim-Evidence-Reasoning (CER)

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

Conclusion

Classify each reaction and support your conclusion using temperature data.

Evaluation

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

Source of errorImprovement

Extension / Challenge

Suggest why repeated trials would improve confidence in the results.

Teacher Assessment (30 Marks Total)

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

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