This is the first egg experiment in a 3 part series. See below for the other experiments' links.
Well, not completely disappearing, just the eggshell. We've been studying birds at our house for several weeks now. We've finally moved onto learning about their eggs. This is the first of our science projects with eggs. Stayed tuned for a couple more. I found this demonstration at Steve Spangler's website.
I labeled our vinegar and tums with both their common names and chemical formula. I know their chemical formula (or rather the chemical formula of the main ingredient) means nothing to the kids, but I wanted to expose them to how they will eventually see things labeled.
The Supplies We Used
vinegar (about 2 cups)
2 eggs- we used pasteurized eggs
a jar with a lid (unless you don't mind smelling vinegar for a week)
We started our project by observing and describing our materials. Juiciness thought the vinegar was water until he smelled it. Our first demonstration was to see what happened when we added vinegar to the Tums.
Sassyfras added the vinegar to a bowl with the tums. They immediately saw bubbling and Little J remembered that this was carbon dioxide gas being released. We watched for awhile and in the end, most of the tums had dissolved.
Then we moved onto observing our egg. They used terms like hard, smooth, cold, and oval like shape to describe it. Little J cracked one of our eggs into a bowl so we could see what was inside and get a better look at the shell.
They found a thin membrane lining the inside of the hard shell.
Little J and Juiciness wanted to touch the egg, but Sassyfras declared it too "yucky". We tried to identify the parts of the egg using information found at Enchanted Learning.
I explained to the kids that the eggshell was primarily made of calcium carbonate, the same ingredient in our tums. As Juiciness put our second egg and vinegar in a jar, I asked the kids what they thought would happen. Sassyfras thought it would crack, but Little J was able to relate back to the tums demonstration and said it would bubble. I had to help him make the jump that it would dissolve eventually. He just couldn't believe it was possible!
Egg Experiments 2 and 3See "The Shrinking Egg Experiment" here.
See "The Incredible Growing Green Egg" here.