Materials Needed:

• Vinegar

• Shells, rocks (hopefully limestone)

• Glass cup or jar

Get Started:

• Pour the vinegar into the glass container
• Add the shells and rocks.
• Notice which ones give off bubbles.
• Do all parts of the shells and rocks give off bubbles?

What does this mean?

• Limestone and shells are carbonates.
• When they come in contact with vinegar there is a chemical reaction, which produces carbon dioxide gas (this is the bubbles).