During an experiment, jon exhales through a straw and blows bubbles into a solution. which observation would most likely indicate that a chemical reaction is occurring?
the bubbles disappear into the solution before reaching the surface. the gas forms a layer above the surface of the solution. the solution becomes very stirred up by the bubbles. the solution becomes cloudy with a white solid.

Answer is: The solution becomes cloudy with a white solid.

Balanced chemical reaction:

CO₂(g) + Ca(OH)₂(aq) → CaCO₃(s) + H₂O(l).

CaCO₃ is calcium carbonate, it is white cloudy solid with solubility in water.

Ca(OH)₂ is calcium hydroxide.

CO₂ is carbon (IV) oxide or carbon dioxide, gas that John exhales.

H₂O is water.

The correct answer is D.

your picture is not part of the scientific method.

the answer is b & c i believe : )