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Properties of Matter Activity for Kids

Slime DIY

  • Duration: 30-60 min
  • Difficulty: Easy
  • Cost: $0 to $5

Make classic slime and explore its properties!

Material List

  • 1Measuring cup
  • 1Cup of water
  • 1Tube of washable glue
  • 1Teaspoon of borax powder
  • 2Mixing bowls
  • 1Spoon or spatula
  • 1Food coloring (optional)


  • 1Measure ½ cup water and ½ cup glue in first bowl.
  • 2Add a few drops of food coloring (optional).
  • 3Mix with a spoon or spatula.
  • 4In a separate bowl, mix 1 teaspoon of borax into ½ cup of water.
  • 5Pour the two bowls of liquid together.
  • 6Mix until it becomes slimy.
  • 7Study the properties of the slime!
  • 8Tip: Do not to use the same bowls you eat from.

How It Works

The ingredients used to make slime undergo a chemical change when they are mixed together. Glue is a thick white liquid, but when mixed with borax it forms a new chemical that is much thicker ... and it's slimy! The properties of the new substance are different: both glue and borax can be dissolved in water, but slime does not dissolve in water. Slime is also more dense than water so it sinks (unless you mixed in a lot of air bubbles when stirring it). Try to study its other properties!

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