Wednesday, May 19, 2010
One of the great experiments in Kindergarten chemistry is making a rubber egg. For this you need vinegar and an egg. To make it a bit more interesting I have the students draw on the egg with permanent marker first. Vinegar is an acid called acetic acid - CH3COOH - and white vinegar from the grocery store is usually about 5% acetic acid and 95% water. Egg shells are made up of calcium carbonate. The vinegar reacts with the calcium carbonate by breaking the chemical into its calcium and carbonate parts (in simplest terms). The shell dissolves and the membrane is left behind. If you're careful you can get a lot of bounces out of it!!