Dry ice is solid CO2. Sublimes at STP. A small 1.3g piece of dry ice is placed inside an empty balloon and tied off. What is the volume of the balloon after all the dry ice sublimes? Assume STP conditions.

Awhite powder is added to a solution. the images show observations made before the powder is added, just after the powder has been added, and a little while later. (the liquid in the small beaker is phenol red solution.) what evidence shows that a chemical change has taken place?