Question

1. you get a can of soda from the vending machine and your friend maliciously shakes it when youre not looking. you open the can of soda and it fizzes all over your desk, making you regret you had brought it to lab in the first place. is this a chemical change or a physical change? explain your answer.

Explanation:

A physical change involves a change in the state or appearance of a substance without altering its chemical composition. When the soda fizzes, it is due to the release of carbon dioxide gas that was dissolved in the soda under pressure. The chemical formula of the soda (e.g., \(H_2O\), sugars, flavorings) remains the same; only the dissolved \(CO_2\) is released as a gas. There is no new substance formed with a different chemical identity.

Answer:

This is a physical change. The fizzing is due to the release of dissolved carbon dioxide gas (\(CO_2\)) from the soda. The chemical composition of the soda (e.g., water, sugars, flavorings) does not change; only the state of the \(CO_2\) (from dissolved in liquid to gas) changes. No new chemical substances are formed.