Substance (chemistry) Steam and liquid water are two different forms of the same pure chemical substance, water. Picture of a formed molecule In chemistry, substance is a unique form of …

A chemical substance is any material that has a definite chemical composition. Moreover, a pure substance cannot be separated into other substances by any mechanical process.

Nov 11, 2025 · Most substances found in nature—such as wood, soil, and rocks—are mixtures of chemical compounds. These substances can be separated into their constituent compounds …

Jul 12, 2024 · A substance is any form of matter that has a consistent and definite composition. It can be either an element, which consists of only one type of atom, or a compound, which …

Mar 5, 2025 · A chemical substance is a form of matter with a defined chemical composition and distinct properties. These substances exist in different states—solid, liquid, or gas—and can …

A chemical substance is defined as a material with a specific chemical composition that can undergo transformations during chemical reactions or biochemical processes, such as those …

A chemical substance is a material consisting of one type of atom or molecule that exhibits a definite chemical composition. Also called pure substances, chemical substances cannot be …

Chemical substances can be single chemical molecules, like water, or mixtures of different chemicals.

A chemical substance is a material with a definite chemical composition. It is a concept that became firmly established in the late eighteenth century after work by the chemist Joseph …

More generally, a chemical reaction can be understood as the process by which one or more substances change to produce one or more different substances. Chemical changes are …