Question

nio conducts a science experiment. he puts yeast into a bottle with water and sugar, and then caps the bottle with a balloon. he returns two hours later and notices there are bubbles on the surface of the mixture in the bottle and that the balloon has inflated, but there are no other apparent changes. what most likely happened? a non - chemical change, because there are no indicators of chemical changes taking place a chemical change, because the mixture changed color a chemical change, because a gas was produced a non - chemical change, because the changes that occurred are reversible

Explanation:

A chemical change involves the formation of new substances. In this experiment, yeast ferments sugar in the presence of water. Fermentation is a chemical reaction that produces carbon dioxide gas. The inflation of the balloon indicates the production of a gas (carbon dioxide), which is a new substance. The presence of bubbles also suggests gas production. Just because there is no color change does not mean it is not a chemical change. Non - chemical changes (physical changes) do not produce new substances. Reversibility is not the key factor here; the production of a new substance (gas) is.

Answer:

a chemical change, because a gas was produced