Brilliant bouncy balls 

Another great way to explore the chemical reaction between glue and borax creating a long string of molecules. The addition of the cornstarch helps to bind the solution together. 

You will need: 
  • 1 tablespoon of PVA Glue

  • 1 teaspoon of Borax

  • 1 tablespoon of Corn Starch 

  • 2 small plastic cups

  • Warm Water (very important to dissolve Borax Crystals) 

  • Plastic Spoon

Instructions: 
  1. Label your cups Borax Solution and Bouncy Ball mix so you don't get confused. 

  2. Next pour 1/2 cup of warm water into the Borax solution cup and add a teaspoon of Borax. 

  3. Mix this well until all the crystals have dissolved. 

  4. Now put one tablespoon of glue into the Bouncy Ball Mix cup. You can add food colouring here or glitter. Remember a maximum of 5 drops so you don't get stains everywhere. 

  5. Add 1/2 teaspoonful of the Borax Mix and 1 tablespoon of Cornstarch. Wait a few moments for these ingredients to interact then mix with a spoon. 

  6. When you can no longer stir the mixture roll the ball in between your hands. This will feel a little gooey and sticky at first but keep rolling it and it will begin to harden. 

  7. Enjoy bouncing your bouncy ball. It will lose it's elasticity after a few days but there will be plenty of time to experiment with it until then. 

Science Challenge 

Now you have made your bouncy ball. Try some bouncing experiments. 

Does temperature effect how high a ball can bounce? 

  • Make two balls the same size with the same recipe. Put one in the fridge and keep one at room temperature. 

  • Stand on a chair and bounce both at the same time. What happened? 

  • Can you think of a reason why temperature might effect bounce? 

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