Pre-K Science – Bouncing Egg
(Day #26: 30-Day Blog Challenge)
Shawn loves to do science experiments and I will gather up a theme (or sometimes just a bunch of random experiments) and we spend an entire afternoon doing them. We did this and a bunch of other egg experiments last winter on one of the many snow days he had from school. It’s neat because I find that with some of them (like this one in particular), I actually learn something cool. For this experiment, we took a raw egg and turned into a soft raw egg that can bounce. For real, this egg is bouncy and squishy too!
This experiment was one that I had never heard of and I wasn’t so sure if it was actually going to work. But it totally did and I thought it was the neatest thing! To do this experiment you only need a couple of things.
A tall drinking glass (a bowl would work too)
Raw egg (you can use a hard boiled egg but what fun is that? I think a raw egg is more interesting)
What You Do:
Carefully place the raw egg inside the glass and fill with the vinegar. Make sure that the egg is completely covered with the vinegar. Let it sit for about 24 hours or until you notice that the shell is gone. After the shell has disappeared, we took out the egg (which now is soft and very fragile) and washed it gently with some warm water. This removes the vinegar and our egg was a little sticky when it came out, so this made it nice and smooth.
We then saw if we could bounce the egg and it really did bounce but if you’re not careful it will break open. We did a lot of observing of this new rubbery egg. We looked at the texture, the color, what happened to the shell and of course, how high we could bounce it. Ours didn’t last too long because it slipped out of Shawn’s hands but it was going to happen at some point. 🙂
Shawn also found out that we could make it glow if you put a flashlight up to it too. It looked really neat because you could see the yolk inside the egg.
How Does This Work:
Egg shells are made of calcium carbonate and since the vinegar is an acid there is a reaction when they are combined. The calcium carbonate reacts with the vinegar and begins to dissolve the shell but the membrane stays intact and makes the egg feel rubbery.