A liquid changes color as it cools and becomes solid. How can you confirm the type of change that took place?

To confirm the type of change that took place, you can observe the properties of the liquid before and after cooling. A physical change is indicated if the substance can return to its original state, such as melting back into liquid when heated. Additionally, you can analyze the molecular structure using techniques like spectroscopy to determine if any chemical bonds have been altered, which would indicate a chemical change. In this case, if the substance simply solidifies without changing its chemical composition, it confirms a physical change.