Submitted by: Rachel Peterson
Endorsed by: Don Descy, Mankato State University
Date: October 28, 1996
Grade Level: K-8
DESCRIPTION : A chicken's egg is enclosed by a shell that has a high calcium content. If a raw egg (shell still intact) is placed in a glass of vinegar, a reaction (RXN) takes place. The acetic acid in the vinegar will dissolve the eggshell and the egg will bounce. The reaction will begin immediately when the egg is placed in the vinegar but will not be complete for two or three days. After two or three days, the egg will survive a drop of four to five inches.
BACKGROUND INFORMATION: This activity can be used to begin a lesson on states of matter. Be sure to completely cover the eggs with vinegar or hard shell will remain on those areas and quickly break the egg when it is dropped. Leave the eggs soaking in the vinegar for at least three days and be very gentle when removing them from the vinegar.
GOAL: The students will observe the chemical reaction between calcium and vinegar.
CONCEPTS: Students will be able to:
a) Have students carefully observe the chemical reaction on their egg.
b) Keep a running journal on how much shell has disappeared.
c) Have students write where the shell has gone and why they feel it disappeared.
*There should be a thick waxy film on the egg.
a) Have entire class watch and record how many times each students egg was dropped before breaking.
*baking soda and fire
*baking soda and vinegar
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