1. Formation of bubbles: When vinegar (acetic acid) is mixed with baking soda (sodium bicarbonate), a chemical reaction takes place, resulting in the formation of carbon dioxide gas. This gas causes bubbles to form and rise to the surface of the mixture.

2. Temperature change: The chemical reaction between vinegar and baking soda is exothermic, meaning that it releases heat. As a result, the temperature of the mixture increases.