Is sublimation of iodine a chemical or physical change?

The structures of the individual atoms involved didn't change. The only thing that happened was that the atoms all absorbed some thermal energy and started vibrating. When they started to vibrate enough, they started to detatch from one another, becoming a gas instead of a solid from that point on. read more

Sublimining iodine is a physical change because nothing is actually happening to the original matter. read more

No. It is a physical change. See explanation. A chemical change (reaction) is a process where one or more substances react to create other substances. Example: NaOH+HCl -> NaCl+H_2O In this reaction from 2 substances (acid and a hydroxide) other 2 substances (salt and water) are created. read more