Is mixing baking soda with iodine solution a chemical or physical change?

When baking soda (sodium bicarbonate) is mixed with iodine solution, a chemical reaction takes place, resulting in the formation of new substances. The iodine solution, which is typically brown in color, turns colorless as the baking soda reacts with the iodine to form sodium iodide and carbonic acid. The carbonic acid then decomposes into water and carbon dioxide gas. The overall reaction can be represented as:

NaHCO3 (baking soda) + I2 (iodine) → NaI (sodium iodide) + H2O (water) + CO2 (carbon dioxide)

This chemical change is irreversible, meaning that the original substances (baking soda and iodine) cannot be easily separated or recovered from the products (sodium iodide, water, and carbon dioxide).