Chemical changes

Cooking involves numerous chemical reactions, such as the Maillard reaction (browning of meats), caramelization of sugars, and denaturation of proteins.

During processes like electrolysis or charging a battery, electrical energy is converted into chemical potential energy.

In a chemical reaction, atoms are conserved but their chemical bonds are broken and formed, causing them to rearrange and group together differently to form new substances.

The synthesis of pharmaceuticals, plastics, and other synthetic materials in the chemical industry relies on chemical reactions to transform raw materials into new substances.

In general introductory science, chemical changes are considered irreversible because the original substances are transformed into new ones with different properties, making them very difficult to recover by simple physical means.

The fire triangle represents the three ingredients needed for combustion: fuel, an oxidizing agent (usually oxygen), and heat (to reach activation energy).

Oxidation of iron in the presence of oxygen and moisture forms rust, which is hydrated iron(III) oxide. Mold is a biological organism, oxygen is a reactant rather than a product, and ferric refers to an oxidation state of iron rather than a compound.