What happens if you pour water in baking soda? Does it release energy? What kind?

When baking soda or sodium Bicarbonate (NaHCo3) reacts with water carbonic acid is formed. The reaction is exothermic (so yes releases energy) that is heat (type of energy released) and Carbonic acid are produced. Carbonic acid is unstable so breaks up into carbon dioxide (which is the fizzy gas you see) and water forms.