Here's why:
* Limestone is made of calcium carbonate (CaCO3).
* Vinegar is a weak acid (acetic acid).
* When vinegar reacts with calcium carbonate, it produces carbon dioxide gas (CO2), water (H2O), and calcium acetate.
The sizzle you hear is the carbon dioxide gas bubbling out of the solution. This reaction is a classic example of an acid-base reaction.
Here's a simple experiment you can try:
1. Gather: A small piece of limestone (you can find this in your garden or at a rock shop), a small bowl, and some vinegar.
2. Place: The limestone in the bowl.
3. Pour: A little vinegar over the limestone.
4. Observe: You should see bubbles forming and hear a fizzing sound.
Safety Note: Vinegar is acidic, so it's best to conduct this experiment with adult supervision.
