Question

describe the phase change dry ice goes through

Answer 1

Changes in its state? Dry ice boils to a gas when exposed to higher temperatures--including room temperature. Liquid state -> gaseous state.

Answer 2

Boils + evaporates, rather

Answer 3

I think it is solid -> gas which is sublimation.

Answer 4

Yes, solid directly to gas is indeed sublimation.

Answer 5

Dry ice is carbon dioxide (CO2) in solid state.
@joannablackwelder is correct that it is sublimation.