Here's the breakdown:
* Dry ice is solid carbon dioxide (CO2).
* Sublimation: When dry ice is exposed to room temperature, it absorbs enough energy to transition directly from its solid state to a gaseous state (carbon dioxide gas).
* No liquid phase: This is unlike regular ice, which melts into liquid water before evaporating.
Therefore, sublimation is a chemical change because the composition of the substance changes from solid carbon dioxide to gaseous carbon dioxide.