My kids love playing with slime! But before they played with slime we played with GOO also known as Oobleck. The great thing about goo is that we learned so much about non-Newtonian fluids. Goo is a suspension of cornstarch and water that can behave like a solid or a liquid depending on how much pressure you apply. Materials that behave this way are classified as non-Newtonian fluid because their flow properties are not described by a constant viscosity. It is so much fun to play with and so easy and simple.
Check it out in action!
In this experiment we use cornstarch, if you saw the video then you heard that cornstarch is a white powder made from corn. In cooking, the usual job of cornstarch is to make a liquid mixture thicker, so cornstarch is a common ingredient in recipes for sauces, puddings, and gravies.
In your journal, you should write down what you predict will happen if the cornstarch is mixed with water? When you complete the experiment, make sure to check your prediction and write down any observations and draw a picture.
What you will need:
1 cup of cornstarch
1/2 cup of water
Liquid Food Coloring
Pens and crayons
What to do:
- First, pour one cup of cornstarch into the bowl.
- Then slowly pour 1/2 cup of water into the bowl.
- Next, add a few drops of food coloring to the mixture.
- Then use your hands to squish the water and cornstarch together.
This experiment works best if you use your hands so don’t be tempted to be neat and use a spoon.
How it works
The particles of cornstarch are too large to dissolve in the water. Instead, as you mix the cornstarch with the water, slimy strings of goo form. The goo is an example of a colloid, a special kind of mixture in which particles of one type of material are suspended in another kind of material. The particles are so small that you may not be able to see that they are actually separate from the liquid or gas in which they are floating unless you can look at the mixture under a microscope.
LET US KNOW!
Did you try this experiment? How did you like it? Let us know in the comments section below. Share your videos and photos with us on Facebook, Twitter and Instagram using the hashtag- #sciencesunday We would love to see you doing the experiments!
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