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.
Wrapper(noun) one who, or that which, wraps. Wrapper(noun) that in which anything is wrapped, or inclosed; envelope; covering. Wrapper(noun) specifically, a loose outer garment; an article of dress intended to be wrapped round the person; as, a morning wrapper; a gentleman's wrapper.