Science Fair Projects World

Chemical Reactions and Temperature


Investigate how temperature affects the rate of a chemical reaction.


  • Hydrogen peroxide (H2O2)
  • Potassium iodide (KI)
  • Graduated cylinder
  • Beakers
  • Thermometers
  • Ice bath and hot plate
  • Stopwatch
  • Notebook for observations


  1. Dissolve potassium iodide in water to create a solution.
  2. Measure a specific volume of hydrogen peroxide in separate beakers.
  3. Heat or cool the beakers to different temperatures using an ice bath or hot plate.
  4. Record the temperature of each solution before mixing.
  5. Add the potassium iodide solution to the hydrogen peroxide and start the stopwatch.
  6. Observe the reaction and record the time it takes for the reaction to complete at each temperature.
  7. Compare the reaction rates at different temperatures and draw conclusions about the effect of temperature on the reaction rate.