Solid iodine, contaminated with salt, was heated until the iodine vaporized. The violet vapor of iodine was

Question:

Solid iodine, contaminated with salt, was heated until the iodine vaporized. The violet vapor of iodine was then cooled to yield the pure solid. Solid iodine and zinc metal powder were mixed and ignited to give a white powder. Identify each physical change and each chemical change.