When a substance is produced is it chemial or physical?

When a substance is produced, it can be either a chemical or physical change, depending on the nature of the process. A chemical change results in the formation of new substances with different chemical properties, like when iron rusts. In contrast, a physical change involves alterations in the state or appearance of a substance without changing its chemical composition, such as ice melting into water. Therefore, the type of change depends on whether new substances are created.