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: a non-chemical change, because there are no indicators of chemical changes taking place
B: a chemical change, because the mixture changed color
C: a chemical change, because a gas was produced
D: a non-chemical change, because the changes that occurred are reversible

Answer 1

Answer: Option (C) is the correct answer.

Explanation:

When yeast is added into a bottle with water and sugar then after some time yeast becomes activated. This results in the formation of a chemical change as bubbles are formed on the surface of the mixture in the bottle.

This indicates that a gas has been released due to the chemical change.

Thus, we can conclude that most likely a chemical change has occurred because a gas was produced.

Answer 2

Answer:

C

Explanation:

I took de test