A "rubber egg" is made by soaking a raw egg with its shell still intact in regular household vinegar for a specified length of time. In 2 to 3 days the egg shell will be completely dissolved by the vinegar, leaving behind the egg cell membrane, which will have taken on a rubbery consistency that holds the egg together.
The shell of an egg is made of calcium carbonate, which is the same composition as that of limestone. The acetic acid in vinegar reacts with the calcium carbonate shell to produce carbon dioxide gas and dissolved salt. This reaction gradually wears away the hard shell of the egg until it is completely gone. The "rubber egg" science experiment is a favorite among elementary students all over the world and it is often conducted to demonstrate the importance of calcium for the bones and teeth.
To make a rubber egg, one will need the following:
Place the egg inside the container gently. Make sure that the egg shell and the membrane are intact.
Pour the vinegar into the container until the egg is completely submerged. Bubbles may already start forming on the shell of egg a few minutes after pouring in the vinegar. Set aside for 2 to 3 days.
After 2 to 3 days, the egg shell will have completely dissolved, leaving a muck floating on the surface of the vinegar. Pour out the vinegar and gently take out the rubber egg.
The rubber egg experiment also demonstrates the semi-permeable properties of the egg membrane, which allows the vinegar to pass through the membrane freely. This same experiment can also be done with chicken bones with the same result, although it may take a few more days to fully dissolve the calcium in the bones.Learn More
A Bunsen burner is made up of the base, a barrel with air holes, a collar, a needle valve and a gas hose. Some of these parts can be adjusted to change the properties of the flame that the burner produces.Full Answer >
The parts of an egg include the shell, the inner and outer membranes, the air cell, the albumen, the chalazae, the vitelline membrane, the yolk and the germinal disc. The shell is hard and porous and serves as a protective layer that allows gases to be transferred in and out of the egg.Full Answer >
Make a bouncy egg by soaking a raw chicken egg in vinegar for three days, then scrape away what is left of the shell. The acetic acid in the vinegar eats away at the shell and produces a firm, bouncy egg with a waxy outer coating.Full Answer >
The curved shape of an eggshell protects against damage, while inner membranes ensure that even if the shell is cracked, it may still stay intact. An eggshell is made up primarily of calcium carbonate crystals, which provide solidity without being brittle.Full Answer >