We are studying birds at homeschool, so egg experiments add a fun dimension to our science classes. These experiments are cheap and fun.
The Egg Crush
Did you know that if you held an egg in your hand and applied and even pressure to it, it won’t break? The egg only breaks if cracked on one side. This is why the birds don’t crack their eggs as they sit on them. The egg’s unique shape gives it tremendous strength, despite its fragility. Eggs are similar in shape to a 3-dimensional arch, which is one of the strongest architectural forms. The egg is strongest at the top and the bottom. That’s why the egg doesn’t break when you add pressure to both ends.
The Naked Egg
Leave the egg in a cup of vinegar and watch the egg shell disintegrate in 24 hours, as the calcium in it gets destroyed by the vinegar solution. The acetic acid in the vinegar reacts with the calcium carbonate in the eggshell to make calcium acetate plus water and carbon dioxide that first you see as bubbles on the surface of the shell and then the shell disappears.
The Glowing Egg
Add fluorescent paint to the vinegar experiment to make your naked egg glow in the dark!
The Corn Syrup Egg
Place the egg in the corn syrup and the egg would shrivel and deflate. The egg is semipermeable, meaning that small particles can go in and out of the cell while large particles stay out. Water and other nutrients are small enough to travel in and out of the egg. When the concentration of water in the egg is different than the concentration of water outside of the egg, the water will move either in or out of the cell to balance the concentration inside and out. This is called osmosis. Osmosis explains why the egg in the corn syrup shriveled up. Corn syrup has a very low concentration of water in it so some of the water from the egg went into the syrup.
Fill one of the drinking glasses almost to the top with plain tap water. Gently drop one of the eggs into the water-filled glass and it would sink to the bottom. Fill the second glass half-full with water. Add four tablespoons of table salt to the water, and stir. Fill the rest of the cup with water, almost to the top. Gently place the second egg into the salt water solution and it would float.
The first egg sank to the bottom of the glass of regular tap water, because a raw egg has a greater density than regular tap water. The egg has more matter stuffed into a specific area (volume) than the same amount of water. When you add salt to the water, you increase the density. The salt adds to the volume of water. With enough salt added to the water, the density of the water is greater than the egg, allowing the egg to float.
A golden egg is an egg that has been scrambled prior to being hard-boiled. Place you raw egg in a stocking. Grab both ends of the stocking and begin the twist it really fast. It would distribute the egg yolk through the egg white, making the egg golden. Take your egg to the dark room and look it at with a flashlight. Look at the regular egg, to and compare the two. The regular egg should have the egg yolk and the egg white separate, while the golden egg is scrambled inside. Now hard-boil the golden egg like you normally would.