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Vinegar is an acid. Eggshells are made of calcium carbonate. If you soak an egg in vinegar the eggshell will absorb the acid and break down, or dissolve. The calcium carbonate will become carbon dioxide gas, which will go into the air. What is left is the soft tissue that lined the inside of the eggshell.
Science Experiment Idea: Make three bouncing eggs. Soak one egg in vinegar for 24 hours (1 day), one egg for 48 hours (2 days) and one egg for 36 hours (3 days). How do the eggs look when done soaking? How does each egg behave when you try to bounce it? Hint: BOUNCE OUTSIDE!
Here are some websites that will help you understands acids and how they behave:
- Chem4Kids: Acids and Bases
- BBC KS3 Bitsize: Acids and Bases and Metals
- Fact Monster: Making Eggs That Bounce
- Planet Science: Can You Make an Egg Bounce?
- BBC Bang Goes the Theory: Rubber Egg
To investigate chemical reactions further – try some more experiments at home!
IndyPL Kids Science Experiment Posts about CHEMICAL REACTIONS:
Acids: Folding Egg
Chemical Bond: Kool Aid Tie Dye
Chemical Reaction: Exploding Ziploc
Chemical Reaction: Penny Cleaner
Chemical Reaction: Plastic Bottle Geyser
Chemical Reaction: Milk Play Dough
Chemical Reaction: Milk Glue
Nucleation: Mentos Volcano
Oxidation: Brown Apples
Here are some books that will help you investigate bouncing eggs.
Words to Know:
Acid – A chemical that is often sour tasting and corrosive. It dissolves some things.
Dissolve – When a solid comes apart and spreads out into a liquid…like kool aid in water.
Calcium – One of the most common minerals found in animals bodies. It makes up bones, teeth, and eggshells.
Absorb – To soak up…like a sponge in water.