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Lions Learning Lab: Just in Time Clock Reaction

Science experiments you can try at home! Justin Huffman from Penn State Altoona’s Lions Learning Lab shares a color changing chemical reaction that you’ll want to see for yourself!

“Just in Time Clock Reaction”

Demonstration Concept

This science demonstration teaches kids about clock reactions, which are chemical reactions that have observable chemical changes that occur at regular time intervals.

Materials (All materials were purchased from Walmart)

  • 3% hydrogen peroxide
  • Food coloring
  • Distilled white vinegar
  • Liquid starch
  • Decolorized Iodine
  • Fruit-Fresh
  • Duck tape
  • Measuring cup
  • Measuring spoons
  • Long flat stick
  • 10 (9 oz) Clear plastic cups
  • Water

Instructions

  • Tape five clear-plastic cups to the long, flat stick using a rolled piece of duck tape.
  • Fill each of the cups with ½ cup of 3% hydrogen peroxide (set this aside until the end).
  • To each of five different plastic cups add ½ cup of distilled white vinegar.
  • Then add 2 drops of food coloring (lighter colors make viewing the color change easier) to each of these cups.
  • Then to each of these cups add 1 teaspoon of liquid starch.
  • Add 2 teaspoons of decolorized iodine to each of the five cups.
  • In a separate cup, add 1 ½ teaspoons of fruit-fresh in ½ cup of water and stir to dissolve. This will be your fruit fresh solution.
  • You are now going to add different amounts of fruit fresh to each of the five cups containing the colored solution.

To cup #1: add ½ teaspoon of the fruit-fresh solution.

To cup #2: add 1 teaspoon of the fruit-fresh solution.

To cup #3: add 1 ½ teaspoons of the fruit fresh solution.

To cup #4: add 2 teaspoons of the fruit fresh solution.

To cup #5: add 2 ½ teaspoons of the fruit fresh solution.

Note: Place these five cups, containing the colored solution, in order from the cup containing the least amount of fruit-fresh to the cup containing the most fruit fresh.

  • Now, pick up the stick with the five glasses, containing the 3% hydrogen peroxide solution and, with one quick motion, pour them into the five the five cups containing the colored solution.
  • Watch the chemistry, watch the magic!!!!!

Visit Lions Learning Lab for more information.

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