This week the students conducted The Naked Egg experiment. In small groups, they immersed an egg in vinegar, letting it sit for 7 days, changing the vinegar in the jars once. When the egg was first exposed to the vinegar, they noticed bubbles forming on the surface of the eggshell. After, they were asked to make predictions about what they thought would happen. Once the week passed, we removed the eggs from the vinegar and observed the changes. They noticed that the shell had dissolved and that the egg itself felt rubbery, like a bouncy ball. It was also translucent.
We discussed the difference between a physical reaction and a chemical reaction as well as the specifics about what occurred here, with the acetic acid from the vinegar reacting with the calcium carbonate of the shell, dissolving it. The reaction also produced water and carbon dioxide, the latter being the bubbles they saw on the surface of the egg. The excitement surrounding the changes prompted them to propose further experiments involving eggs and a variety of other substances including varying the strength of the acids or parts of the egg used in the experiment.
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