Use the experiment described to answer the question.

Question

You will conduct an experiment at home.

Use the following materials:

Clear plastic bottle
150 mL of hot water
Yeast
Sugar
Balloon
Teaspoon
Follow these directions:

Start by pouring three teaspoons of yeast and two teaspoons of sugar into the plastic bottle. Then slowly pour the hot water into the bottle. Stretch the opening of the balloon, and place it over the bottle’s opening. Wait approximately 30 minutes. Observe the balloon inflating as the liquid starts to foam.

How do you know that a chemical change occurred in the experiment?

(1 point)
Responses

the balloon was stretched over the bottle
the balloon was stretched over the bottle

the hot water warmed the bottle
the hot water warmed the bottle

the yeast mixed with sugar
the yeast mixed with sugar

the balloon inflated

Answer 1

The correct response to indicate that a chemical change occurred in the experiment is:

the balloon inflated.

The inflation of the balloon is evidence of gas production (carbon dioxide), which indicates that a chemical reaction took place between the yeast and sugar in the warm water.