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PAG 4: Rates of Reaction

Investigate how concentration, temperature, and catalysts affect reaction rate

Required PracticalOCRA-Level

๐Ÿ”ฌ Equipment Required

  • Conical flasks
  • Measuring cylinders
  • Stopwatch
  • Water baths at different temperatures
  • Thermometer
  • White paper with cross (for disappearing cross)
  • Gas syringe (for gas production)
  • Colorimeter (optional)
  • Data logger (optional)

๐Ÿฆบ Safety Precautions

  • Wear safety glasses
  • Sulfur dioxide may be produced - work in fume cupboard
  • Take care with hot water baths
  • Some catalysts are toxic
  • Hydrogen peroxide is an oxidizer

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About PAG 4: Rates of Reaction

PAG 4: Rates of Reaction is a required practical for OCR A-Level Chemistry. This practical investigate how concentration, temperature, and catalysts affect reaction rate

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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