Question

YEAST LAB !13points

1. What gas is slowly filling up the balloons?

2. Would that gas be a product or a reactant?

3. This reaction uses Yeast and Sugar as the reactants but no oxygen. What type of chemical reaction is this?

Answer 1

As the yeast feeds on the sugar, it produces carbon dioxide. With no place to go but up, this gas slowly fills the balloon.

A very similar process happens as bread rises. Carbon dioxide from yeast fills thousands of balloonlike bubbles in the dough. Once the bread has baked, this is what gives the loaf its airy texture.