Yeast, Sugar, and Water
After 30 mins we checked our experiment and our flattened balloon was now blown up. We learned that yeast uses sugar as food, and this produces carbon dioxide. Since we are studying bread, I explained that carbon dioxide gas in bread dough helps the bread to grow up and out.
Yeast, Salt, and water
Yeast needs sugar to grow. Yeast breaks the sugar apart to get energy to grow. This is what produces carbon dioxide. So no carbon dioxide this time.