Science Experiment: Reptile Egg

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During a unit on reptiles, our girls completed this cool egg experiment, in order to find out what a reptile egg feels like. Want to find out what happens when you add an egg whose make-up consists of mostly calcium carbonate to a mild acid?

All you have to do, is add 1 cup of vinegar to a glass. I used white vinegar.  Add a raw egg and let sit overnight, making sure the egg is completely submerged. 

We noticed that the vinegar started bubbling and foaming around the egg, especially.

Using a spoon, take the egg out, and gently squeeze.  This is what a reptile shell feels like!

Don't squeeze too hard!  It could break!

Reptile eggs carry a built-in food supply in their tough and pliable, but leathery shell. 

The other thing we noticed, was that the vinegar passed through the shell, causing it to swell.  Because we like to do strange things in our family, we tried it again, this time adding food coloring, and waiting 4 days. 

Notice the size difference between a regular egg, and one placed in vinegar? 

The girls wanted to see if the food coloring passed through the shell, as well, so cut it open with a knife. Make sure to supervise your kids during this step, or take on the cutting task yourself.  This was such a fun way for them to explore and learn on their own.  Part of the egg yolk had completely hardened and the insides were rubbery. 

I heard from this guy, that if you rinse the vinegar out and add a new batch of vinegar to the egg, and wait for 6 days, you can have even more fun!  Are you going to try?  Write in and let me know how it goes!

To further instruct, check out this cool anatomy chart of a chicken egg.