Why is soda that goes flat a physical change?

Answer 1

Opening a soda can/bottle is a physical change. A good way to figure this out is to ask- can the change be reversed? Soda is formed when carbon dioxide (CO2) gas gets mixed with the flat soda to cause the bubbly fizz. When soda can is opened the pressure causes the CO2 to create an explosion of bubbles. Soon after the soda 'calms down' it eventually becomes flat. this flat soda can once again be 'injected with carbon dioxide to become bubbly.

Answer 2

Physical - it can return to its original state, and go back to having fizz (if you stir it or shake it up). If the soda sits open in the refrigerator or on the counter for a while, it will lose its carbonation, and therefore go through a chemical change.

Answer 3

Nope. The pressure keeps the Carbon Dioxide dissolved in the liquid, and when that pressure is relieved, the CO2 rapidly returns to its gaseous state. None of the molecules are reacting or changing, although the CO2 switches from aqueous to gaseous phase.

Answer 4

When soda goes flat, the bubbles of carbon dioxide escape from the liquid, causing a change in the physical properties of the soda without changing its chemical composition. This is a physical change because no new substances are formed, only the arrangement of molecules within the soda is altered.

Answer 5

Physical change. The sugar just well..."dries" out.

Answer 6

It's a physical change because you still end up with soda, it hasn't changed into something else. You cant get it back to its original bubbly state, but it is still soda.