Substanceschemicals
Substanceschemicals refers to the concept that combines chemical substances and chemicals. In science, a chemical substance is a form of matter with a definite composition and set of properties. It can be a pure element, such as oxygen (O2), or a compound, such as water (H2O). Substances differ from mixtures, which have variable composition and may separate into components.
In common usage, chemicals are substances used in science and industry; the term is also applied loosely
Nomenclature and identification: chemical substances are named using conventions such as IUPAC naming, and are often
Properties: substances have physical properties (melting point, boiling point, density), chemical properties (reactivity, acidity or basicity),
Applications: chemical substances underpin research, manufacturing, environmental analysis, and regulatory compliance.
Safety and regulation: safety data sheets (SDS), the Globally Harmonized System (GHS) of classification and labeling,
This entry notes that "substanceschemicals" is not a standard term in professional use, but serves to discuss