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.
packet noun [ C ] (CONTAINER) B1 UK a small paper or cardboard container in which a number of small objects are sold: a packet of cereal/biscuits/crisps/peanuts. a packet of chewing gum/cigarettes. Compare. pack noun. package noun.