Indications of a Chemical Change. 1  Evolving bubbles or releasing gas. 2  Absorbing or releasing heat. 3  Changing color. 4  Releasing an odor. 5  Inability to reverse the change. 6  Precipitation of a solid from a liquid solution. 7  Formation of a new chemical species. This is the best and surest indicator.
Definition of packaging. 1 : an act or instance of packaging something or someone: such asa : the enclosing of something in a container or covering â¦ damage caused by static charge during packaging, storing, and shipping.
'parcel' and 'package' A parcel or package is an object or group of objects wrapped in paper, that can be carried somewhere or sent by post. The two words have almost exactly the same meaning in British English, but a parcel usually has a more regular shape than a package.