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PSPKK12

Oil and Water Science Activity

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Kids in preschool, kindergarten, and first grade learn simple and fundamental science concepts from performing this oil and water science activity. Learn why oil and water do not mix and thrill the kids by creating gorgeous food coloring fireworks in a jar.

A little girl looking at a glass full of liquid with food coloring

Getting the Oil and Water Experiment Ready

We headed into the kitchen to gather the following supplies:

  • Clear container
  • Water
  • Vegetable oil
  • Food coloring

We filled our clear container about 3/4 full of water. We used a tall vase, but any kind of clear cup, jar, or bowl will work.

The kids added a layer of vegetable oil to the vase. We noted how oil and water don’t mix and how all of the oil floated on top of the water layer.

Kids in preschool, kindergarten, and first grade learn simple and fundamental science concepts from performing this oil and water science activity.

Doing the Oil and Water Science Experiment

The kids chose a few colors to add to the oil and water. Carefully, they squeezed one drop at a time into the vase. We dropped about 6 drops of food coloring of various colors into the vase.

Kids in preschool, kindergarten, and first grade learn simple and fundamental science concepts from performing this oil and water science activity.

Next, we waited. We noticed how the food coloring beaded up into little droplets that hovered in the oil layer, right above the layer of water. The kids kept asking when or if something else was going to happen and I kept telling them to be patient and wait without disturbing the vase.

Within a couple of minutes the waiting paid off. Without any warning, one drop of food coloring suddenly fell into the water layer, leaving a colored trail behind. The kids were so excited!

Kids in preschool, kindergarten, and first grade learn simple and fundamental science concepts from performing this oil and water science activity.

One by one, each droplet of food coloring burst through the oil layer and mixed into the water. Watching the trail of colors spread and mix was the best part!

Kids in preschool, kindergarten, and first grade learn simple and fundamental science concepts from performing this oil and water science activity.

The Science Behind Mixing Oil and Water

This is such a simple science experiment, but it teaches big, important concepts!

First, it is easy to observe how oil and water do not mix, no matter how much they are stirred. This is because oil is made of carbon and hydrogen atoms that form non polar chemical bonds. Water is made of oxygen and hydrogen atoms that form polar chemical bonds. It’s pretty advanced chemistry for a 5 or 6-year-old! The important part is that oil and water are made of different kinds of chemical bonds that prevent them from mixing.

Kids in preschool, kindergarten, and first grade learn simple and fundamental science concepts from performing this oil and water science activity.

Food coloring is water-based so it will only dissolve in the water layer. The drops of food coloring bead up in the oil layer and rest between the oil and water until gravity eventually pulls it down into the lower water layer. Once it bursts into the water layer it immediately starts to mix in and spread out. This creates a spectacular fireworks effect!

It’s also easy to observe how oil floats on top of water. Oil is less dense than water, meaning that it will always end up on top, no matter which liquid is added first.

Doing science with this oil and water science activity is a fun and educational way to learn!

More Science Activities and Ideas

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Filed Under: Crafts/Activities, Experiments, Science Tagged With: Kindergarten, Pre-K, Preschool

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