You will need:
- Thin chicken Bones
- 1 cup vinegar
- Clear jar or glass
What to do:
- Take some thin chicken bones and drop them in vinegar for a day. Take them out and they’ll be soft just like egg shells.
- Now you can tie them in a knot, just like a piece of string.
- Leave them sitting out on the table and they’ll get hard again!
What is happening:
- What makes our bones hard? Calcium carbonate
- Vinegar is an acid known as acetic acid.
- When calcium carbonate and acetic acid combine, a chemical reaction takes place and carbon dioxide (a gas) is released. This is what the bubbles are made of.
- The chemical reaction keeps happening until all the carbon in the bones is used up — it takes about a day.
- When you take the bones out of the vinegar it’s soft because all of the carbon floated out of the bones in those little bubbles.
- Take them to school for sharing time and see if your classmates can figure out how you did it!