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A chemical substance is a unique form of matter with constant chemical composition and characteristic properties.[1][2] Chemical substances may take the form of a single element or chemical compounds. If two or more chemical substances can be combined without reacting, they may form a chemical mixture.[3] If a mixture is separated to isolate one chemical substance to a desired degree, the resulting substance is said to be chemically pure.[4] Chemical substances can exist in several different physical states or phases (e.g. solids, liquids, gases, or plasma) without changing their chemical composition. Substances transition between these phases of matter in response to changes in temperature or pressure. Some chemical substances can be combined or converted into new substances by means of chemical reactions. Chemicals that do not possess this ability are said to be inert.
Read moreA chemical substance is a unique form of matter with constant chemical composition and characteristic properties.[1][2] Chemical substances may take the form of a single element or chemical compounds. If two or more chemical substances can be combined without reacting, they may form a chemical mixture.[3] If a mixture is separated to isolate one chemical substance to a desired degree, the resulting substance is said to be chemically pure.[4] Chemical substances can exist in several different physical states or phases (e.g. solids, liquids, gases, or plasma) without changing their chemical composition. Substances transition between these phases of matter in response to changes in temperature or pressure. Some chemical substances can be combined or converted into new substances by means of chemical reactions. Chemicals that do not possess this ability are said to be inert.
