Wednesday, June 13, 2012

The Bouncing Egg Experiment - Preschool Science


I saw this experiment (eggsperiment) on Mom to Posh Lil Divas and I thought that Lillie would enjoy it. 
What you will need:
2 brown eggs
2 white eggs
Vinegar
Water
4 clear glasses to watch the reaction happen.

Gently place 1 egg in each glass.  Add vinegar to 1 white egg glass and to 1 brown egg glass.  Add water to 1 white egg glass and 1 brown egg glass.  I put in enough water or vinegar to cover the egg.  Then we watched.  Within minutes we saw bubble forming and coming off the eggs that were placed in the vinegar.  (see the little lines in the vinegar above the egg?)
 Then the eggs (in vinegar) started to bob to the top of the vinegar.  First, the white egg.
 Then the brown egg.
 I was curious as to why the egg floated and I found on the internet that: "An egg floats due to the release of bubbles of Carbon Dioxide gas from the reaction of the vinegar with the Calcium Carbonate of the eggshell. The bubbles cling to the shell giving it lift."
By the end of the day, we saw the layers of the egg coming off of the egg.
We also saw lots of bubbles and egg layers at the top of the vinegar.  No change occurred to the eggs in water.
The next day, we saw more bubbles and more soft eggshell layers at the top of the vinegar.  At this point, I should have dumped out the vinegar and rinsed the vinegar eggs in water.  After rinsing them, place them back into glasses of vinegar.  This speeds up the process of the vinegar dissolving the shell.  Later in the experiment, I read this instruction on another website.
On Day 3, we compared the eggs in water and vinegar and noticed that the size of the bubbles were bigger and more of the eggshell layers were coming off.  We also noticed that the eggs in vinegar seemed bigger than the ones in water.

There was basically no change to the eggs between day 3 and 9.
 Finally, by day 9 the final layers were starting to disappear.

After a week, I was surprised that all of the shell wasn't gone, like I had seen in the Mom to Posh lil divas post. So, I looked up other egg experiments on the Internet.  I found that on day 2, I was suppose to dumped out the vinegar and rinsed the vinegar eggs in water. After rinsing them, place them back into glasses of vinegar. This speeds up the process of the vinegar dissolving the shell.
So, I rinsed them on day 11 to remove the final shell.
After rinsing the eggs, we laid them out on a paper towel to compare them.  The eggs that were in vinegar were larger than the ones that were in water.
 The eggs that were in water still had hard shells, but
 the eggs that were in vinegar were squishy.
 Now for the bouncing.  Lillie bounced the egg several times at a lower height. 
 When we tried a height approximately 12" from the counter, it broke.
 The yoke was squishy, but firm.
 Then we had fun with the other egg, until...
 Sophie wanted to bounce it.  On her first try, it bounced off the counter and onto the floor.
It was a great experiment and I can't wait to try it again.
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