Question

this passage describes a chemical reaction. read the passage. then, answer the question below. why are there often holes in slices of bread? the holes are created by bubbles of carbon dioxide gas (co₂) that form in the bread dough before and during baking. these bubbles form when single - celled organisms called yeast break down glucose (c₆h₁₂o₆), a sugar in flour. in addition to carbon dioxide gas, a substance called ethanol (c₂h₆o) forms during this process. in the chemical reaction described in the passage, which of the following are reactants? select all that apply. carbon dioxide (co₂) glucose (c₆h₁₂o₆) ethanol (c₂h₆o)

Explanation:

To determine reactants, we analyze the passage: Yeast breaks down glucose ($\ce{C6H12O6}$) to form carbon dioxide ($\ce{CO2}$) and ethanol ($\ce{C2H6O}$). Reactants are substances used up in a reaction (the starting materials), while products are formed. So glucose is a reactant, and $\ce{CO2}$ and ethanol are products. The original selections were incorrect; only glucose is a reactant here.

Answer:

Only the option "glucose ($\ce{C6H12O6}$)" is a reactant. So the correct selection is:
glucose ($\ce{C6H12O6}$)