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.
Definition of packing. 1  1a : the action or process of packing something; also : a method of packingb : the processing of food and especially meat for future sale. 2  2 : material (such as a covering or stuffing) used to protect packed goods (as for shipping); also : material used for making airtight or watertight packing for a faucet.