Question

Are bubbles a result of a chemical reaction?

Answer 1

They could be....

Explanation:

We are flying blind here, because we don't know the details of the experiment. Shake a bottle of soda water, and clearly this is not a chemical reaction...the bubbles observed are merely the carbon dioxide coming out of solution....a manifestation of physical change...on the other hand if a chunk of sodium metal is added to sodium you would see a vigorous effervescence........

`Na(s) + EtOH(aq) rarr Na^(+)""^(-)OEt(aq) +1/2H_2(g) uarr`

And in this scenario the bubbles are clearly the result of CHEMICAL change...