A chemical substance is a form of matter having constant chemical composition and characteristic properties.[1][2] Some references add that chemical substance cannot be separated into its constituent elements by physical separation methods, i.e., without breaking chemical bonds.[3] Chemical substances can be simple substances,[4] chemical compounds, or alloys. Chemical elements may or may not be included in the definition, depending on expert viewpoint.[4]
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A chemical substance is a form of matter having constant chemical composition and characteristic properties.[1][2] Some references add that chemical substance cannot be separated into its constituent elements by physical separation methods, i.e., without breaking chemical bonds.[3] Chemical substances can be simple substances,[4] chemical compounds, or alloys. Chemical elements may or may not be included in the definition, depending on expert viewpoint.[4]
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