>The chemical equation for this reaction is:

CaCO3(s) + 2CH3COOH(aq) → Ca(CH3COO)2(aq) + H2O(l) + CO2(g)

The bubbles of gas that are produced are carbon dioxide. This gas can be identified by its characteristic odor and by the fact that it will turn limewater milky. To test for the presence of carbon dioxide, a small piece of limewater paper can be held near the bubbles. If the limewater paper turns milky, then carbon dioxide is present.

Here are some additional observations that can be made about this reaction:

* The reaction is exothermic, which means that it releases heat.

* The marble chips will dissolve in the vinegar, forming a solution of calcium acetate.

* The carbon dioxide gas will escape from the solution as bubbles.

* The reaction will stop when all of the marble chips have dissolved or when all of the vinegar has been used up.