Chemicals are substances that can be classified into different categories based on various characteristics and properties. Here are some common categories for classifying chemicals:

Organic Chemicals: These chemicals are primarily composed of carbon along with hydrogen, and often contain elements such as oxygen, nitrogen, sulfur, and phosphorus. Examples of organic chemicals include hydrocarbons, proteins, fats, and sugars.

Inorganic Chemicals: Inorganic chemicals consist of pure chemical elements and compounds that do not contain carbon-hydrogen (C-H) bonds. They may include elements like iron, gold, silicon, and sodium. Inorganic chemicals are often used as raw materials or in various chemical processes.

Organometallic Compounds: These compounds combine organic groups containing carbon atoms with metal atoms. Organometallic compounds are used in various chemical reactions and catalytic processes.

Pure Substances: Pure substances are chemicals that consist of a single type of atom or molecule. Water (H2O) is a classic example of a pure substance.

Miscellaneous Chemicals: This category includes chemicals with diverse chemical compositions that find applications in a wide range of industries, such as pharmaceuticals, agriculture, petrochemicals, and more.

Chemicals can also be classified based on other characteristics, such as toxicity, physical properties, and specific applications. The categorization of chemicals is essential for proper handling, storage, and understanding their behavior in various contexts.