Question

When dry ice is exposed to the air, it changes to a vapor. This is an example of ___.

Answer 1

Answer: Sublimation

Explanation:

Sublimation is a physical process in which the transition of a substance takes place from a solid to the gas without undergoing into the intermediate phase of liquid.  

The solid dry ice when exposed to air can be directly converted into a gaseous form that is vapor. Thus process is an example of sublimation.

Answer 2

Sublimation. This is when a solid goes directly into a gas. The dry ice changes immediately into a vapor. 

Hope this helps!