If baking powder fizzes in vinegar is it a chemical reaction?

The baking powder contains sodium bicarbonate and an acid, such as cream of tartar. When the baking powder is mixed with vinegar, the acid reacts with the sodium bicarbonate to produce carbon dioxide gas. This gas causes the mixture to fizz. The chemical reaction that takes place is:

NaHCO3 + CH3COOH → CO2 + H2O + CH3COONa

This reaction is a type of acid-base reaction, in which an acid and a base react to produce a salt and water. In this case, the acid is vinegar (CH3COOH), and the base is sodium bicarbonate (NaHCO3). The salt that is produced is sodium acetate (CH3COONa), and the water is a byproduct of the reaction.