Dinosaur STEM Activity: Fizzy Egg Exploratory Play

For most kids, there are few things more exciting than hatching eggs and dinosaurs.

Put those two things together and you have yourself a super engaging science activity for kids.

Today I’m sharing the steps to make your own colorful baking soda dinosaur eggs.

It’s a fizzy, messy, colorful outdoor activity your children will love!

Kids will love this dinosaur STEM activity where they “hatch” baking soda eggs and vinegar to uncover a plastic dinosaur toy.

Read on to see how to make these with your kids and also check out all of our dinosaur activities for more fun.

Dinosaur STEM Activity

Dinosaur Eggs For Kids Supplies:

• Baking Soda
• Cornstarch
• Water
• Food Coloring
• Ziploc Bags
• Kids Nitrile Gloves
• Mini Plastic Dinosaurs
• Vinegar
• Plastic Medicine Droppers
• Activity Trays

How To Make Dinosaur Eggs:

1. Add 3 heaping tablespoons of baking soda and 1 heaping teaspoon of cornstarch to a Ziploc bag.

2. Add one tablespoon of water and a couple of drops of food coloring to the bag. Close the bag. On a covered surface, gently knead the bag to mix the ingredients.
3. Once the ingredients have created a paste-like liquid and all the food coloring is mixed in well, stop kneading.
4. Repeat the steps above for a variety of colors.

5. Using gloves ( it’s very important you use gloves to avoid staining your hands), remove the mixture from the bags onto a cookie sheet.
6. Pat together one half of an egg shape, add a mini plastic dinosaur and pat more of the baking soda mixture on top of the dinosaur.
7. Gently shape the baking soda mixture into an egg shape.
8. Add the shaped eggs into a small container and put in your freezer.
9. Freeze for about 2-3 hours, until hard.

10. Place the eggs into a plastic activity tray.
11. Give your children a bowl with vinegar in it and plastic medicine droppers. Let them squeeze vinegar onto the dinosaur eggs and watch the chemical reaction! The eggs will fizz and bubble and reveal the mini plastic dinosaurs inside.

If you’d like the mixture to foam even more, add a bit of dish soap to the pan before you place the eggs into it.

Note: I strongly suggest having your children wear play clothes and gloves for this experiment to avoid stained clothes and hands. In the video below I used gel food coloring and it did not stain hands or clothes.

This activity is so entertaining, but beware it can become quite messy!

If you’d rather not deal with the food coloring getting on hands or clothes, simply leave it out – your kids will have just as much fun.

More Easy Dinosaur Activities

• Dinosaur Handprint Art Activity
• Printable Dinosaur Pattern Block Mats
• Dinosaur Color By Number Printables

Want More Dinosaur Fun?