Definition of «chemical changes»

Usage examples

1. Chemical changes occur when the color of a substance changes. For example, when an iron nail rusts and turns from silver to reddish-brown, it is a chemical change.
2. Combustion reactions also demonstrate chemical changes. When wood burns, it undergoes a chemical reaction with oxygen in the air, resulting in the release of heat, light, and the formation of new compounds, such as carbon dioxide and water vapor.
3. Electrolysis is another instance of chemical changes. When an electric current passes through water, it undergoes electrolysis, breaking down water molecules into hydrogen and oxygen gases, resulting in a chemical change.
4. Chemical changes are also evident in the process of digestion. The breakdown of food in our stomach involves chemical changes as enzymes and acids break down complex molecules into simpler forms that our body can absorb and utilize.