Our First Science Fair


March 16, 2015 by 2princessees

Big E loves science, so when the Science Fair rolled around we knew that she would love to participate. She’s only in kindergarten, so the fair is totally optional at this point.

We started off by going to the library and looking at the science fair books. There were a ton to choose from. We checked out several to have a closer look once we got home. When we asked her what kind of project she wanted to do, she said, “Rainbows.” We should have guessed! At least that was a starting point to give us some direction. Then, we had to find one that was appropriate for a 5 year old. There are a lot of neat projects out there, but there aren’t a lot that are geared toward a kindergartener!

We picked to make a liquid rainbow. To do this, we needed to learn all that we could about density. We found this great book on Density . It was really geared toward a younger reader, so it was informative but simple. We read and talked about this book a few times. We put different amounts of marbles on plates to demonstrate density, and she pointed the plate with the most density of marbles. Then, we made a list of the things she learned about density.


Next, we gathered all our supplies for the experiment. You’ll need:

  • food coloring: red, purple, and green
  • 1/2 cup corn syrup
  • 1/2 cup olive oil
  • 1/2 cup blue dish soap
  • 1/2 cup rubbing alcohol
  • 1/2 cup water
  • 5 small cups
  • 1 bigger container

After we had all our supplies in one spot, we had to put each liquid in their own cup and add color if necessary. Here’s how we did it:

  • Pour 1/2 cup corn syrup in a small cup. Add 1 drop of red food coloring and 1 drop of blue food coloring. Mix to combine. This is also a good time to talk about mixing colors if your child doesn’t already know. My two year was pretty impressed that we could turn red into purple!
  • Pour 1/2 cup blue dish soap into another small cup.
  • Pour 1/2 cup water into a small cup. Add 2 drops of green food coloring.
  • Pour 1/2 cup olive oil into a small cup.
  • Pour 1/2 cup rubbing alcohol into another cup. Add 2 drops of red food coloring.

Now that everything was prepped, we could talk about a hypothesis. Big E picked up each cup and swirled the liquids around to help her decide which liquid had the most density. We made a drawing of the prediction.


After she made her hypothesis, it was time to do the experiment. To make a rainbow, slowly pour each of the small cups of liquid into the bigger cup. Pour them in this order:purple, blue, green, yellow, red.

*HINT* If you pour too quickly, the colors will combine and the experiment will not work! Be sure to go slow. The first time we tried, we went too fast, and the green disappeared. We tried again, very slowly, and we made a rainbow.

Big E found that the purple corn syrup was the most dense because it was on the bottom. The red alcohol was the least dense because it stayed on top. You can see in the collage below, that in her hypothesis she thought the yellow oil would be on the top. She drew a new conclusion chart with two columns since we did it twice.


The picture on the far left of this collage is the day of the science fair. Little E had to be in the picture we took as we dropped Big E off at school. She ended up winning first place for kindergarten at her school! She got a ribbon and a medal, which I somehow forgot to take a picture of. Most of all she had fun doing science!

We are so proud of Big E and her love of learning!


One thought on “Our First Science Fair

  1. […] house love science experiments. I’m going to pick a couple to try this week! And look….Big E’s science fair project that we did last year made their list […]


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