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The Amazing Egg Part 1

This is a fun experiment. It takes more than one day, but is a good illustration of the scientific principles. You will be turning an egg into a rubbery ball to found out how your cells get food. After you are finished with this part of this part of the experiment, continue on to The Amazing Egg Part II.

INGREDIENTS OR SUPPLIES:

1 uncooked egg in its shell*
jar with a lid (old mayonnaise or peanut butter jar)
white vinegar
measuring tape

DIRECTIONS:

1. Wrap the measuring tape around the middle of the egg. Write down that measurement.

2. Place the egg inside the jar. Make sure that it does not crack as you are putting it in.

3. Pour enough white vinegar over the egg to completely cover it. Screw the lid of the jar back on.

4. Leave the egg in the jar for three days. Every once in a while, look to see if it is changing and how.

5. After three days, carefully take the egg out of the jar. Measure around the middle of the egg again.

What happened?

When you put the egg in the vinegar, you see bubbles. After three days the shell of the egg is gone and the egg has gotten bigger.

Why? The eggshell is made of a substance similar to limestone. When the acid in the vinegar touches the shell, there is a chemical reaction. The shell breaks down during the reaction, creating gases including carbon dioxide, resulting in the bubbles that you see.

Vinegar has water in it. The water moves through very small holes in the egg’s membrane. This process is called osmosis. As more water goes inside the egg, it gets bigger. This is the same way that nutrients move into your body’s cells.

*Save this egg for The Amazing Egg Part II.

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