Where chemical methods are used to alter the composition or structure of substances, or to synthesize new substances, they belong to chemical production technologies, that is, chemical processes, and the resulting products are called chemicals or chemical products. Chemical products are divided into the following categories: 1. The chemical ore sulfide phosphate mineral boron ore other chemical ores 2. Inorganic chemical raw materials acid alkali inorganic salts other metal salts oxides elemental industrial gases other inorganic chemicals raw materials 3. Fertilizers Fertilizer nitrogenous fertilizer Fertilizer Potassium Fertilizers