A substance that is composed of two or more elements, chemically combined with one another in a fixed proportion of mass is called ___

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Solution

Elements combine to form compounds. A compound called calcium carbonate with the formula ${CaCO}_{3}$ has a fixed proportion by mass of calcium, carbon and oxygen (in 10:3:12 ratio). Any proportion that is different from this is no longer called calcium carbonate because the chemical nature of the compound changes.

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