This post is part of the 31 Days of STEM activities for kids series. Find the other posts here!
Before today, I had never attempted to make homemade slime. It seemed like it would be intimidating and take along time. But surprisingly enough, it was super-easy and a fun way to teach the kids about chemical bonds on a basic level.
If you are ready to take on the same project, here is how we did it:
Slime forms when polyvinyl alcohol and borate ion mix. The polyvinyl alcohol is attracted to borate ion, which causes them to form long chain molecules. When this reaction occurs, the two separate materials mix and slime is formed.
For this experiment you will need:
- School glue (we used glitter glue and it worked great)
- Food coloring (optional)
Mix about ½ a cup of water and a teaspoon of borax until the borax dissolves.
Dump the glue into a separate bowl, and if you aren’t using glitter glue, add some food coloring if you like.
Pour the borax mixture into the glue mixture. Stir for a few seconds with the spoon, then use your hands for the rest of the mixing. If you mix a lot in, the glue will get stiffer.
We thought our slime would be really oozy, but it turned out stiffer than we thought it would. Our slime had a fairly stiff consistency, but that could also be because we used glitter glue instead of the standard glue. We also didn’t have quite as much glue as the recipe called for, so that could also be a reason why our slime was slightly stiff.
Don’t forget to check out the other posts in the 31 days of STEM activities for kids series!
When you pull the slime slowly, it pulls apart like hot cheese. When you pull it quickly, it breaks apart like cold cheese. The girls loved squishing the slime, watching the pieces reform into a solid whole, and in Bo’s case, she loved crumbling our slime into tiny pieces.