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\

a chemical change, because a gas was produced

Explanation:

A physical change is defined as a change in which a change in shape, size takes place. No new substance gets formed in these reactions.

A chemical change is defined as a change in which a change in chemical composition takes place. A new substance is formed in these reactions.

Indicators of a chemical reaction are as follows:

1. Energy absorption or release

2. Evolution of gas

3. Change in color

4. Formation of precipitates

the working equation for the angular size is the product of the physical size and 360 degrees divided by the product of two pi and distance from earth. the minimum size would be 0.559 degrees while the maximum size would be 0.49 degrees.