State four characteristics of a chemical change?

Chemical change:

• A chemical change is a permanent change in which new substances are formed.
• The chemical change is permanent and cannot be reversed by a simple physical method.
• A chemical change involves an exchange of energy in the form of heat or light.
• For example, rusting of iron, burning of wood, respiration, etc.

Characteristics of a chemical change:

• A chemical change involves an exchange of energy in the form of heat or light.
• The chemical change is permanent and cannot be reversed by a simple physical method.
• A chemical change is a permanent change in which the original substance loses its own composition and properties.
• A chemical change cannot be reversed.