Final answer:
The statement is true; sublimation of dry ice is a physical change because it involves a change in state without altering the substance's chemical identity.
Step-by-step explanation:
True or False: dry ice undergoing sublimation is an example of a physical change.
This statement is True. Dry ice, or solid CO₂, undergoes sublimation when it transitions from the solid state directly to the gaseous state without passing through the liquid state at room temperature and standard pressure. This change is physical because it involves a change in the state of the matter without altering the chemical identity of the substance involved. The sublimation of dry ice is similar to the melting of an ice cube in that the shape and physical properties change, but the chemical composition remains the same. Just as water retains its molecular structure of two hydrogen atoms and one oxygen atom when it changes from ice to water vapor, CO₂ remains chemically unchanged during sublimation.