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PAG 3: Enthalpy Changes

Measure enthalpy changes for reactions including neutralisation, dissolution, and combustion

Required PracticalOCRA-Level

๐Ÿ”ฌ Equipment Required

  • Polystyrene cup calorimeter
  • Thermometer (0.2ยฐC precision)
  • Measuring cylinder
  • Balance
  • Stirring rod
  • Lid for calorimeter
  • Stopwatch
  • Graph paper for cooling corrections

๐Ÿฆบ Safety Precautions

  • Wear safety glasses
  • Reactions may be strongly exothermic
  • Handle hot solutions carefully
  • Some reactants are corrosive
  • Ensure good ventilation for combustion experiments

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About PAG 3: Enthalpy Changes

PAG 3: Enthalpy Changes is a required practical for OCR A-Level Chemistry. This practical measure enthalpy changes for reactions including neutralisation, dissolution, and combustion

Students are expected to understand the method, identify and control variables, use appropriate equipment, analyse results, draw graphs, identify sources of error, suggest improvements, and consider safety precautions.

Questions on required practicals frequently appear in OCR A-Level Chemistry exams and can be worth significant marks. Practice with our AI-generated questions to master this practical.

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