A compound is a pure substance made up of two or more elements combined chemically in a _______ proportion by _______ :
A
variable, volume
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B
definite, mass
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C
constant, weight
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D
Both B and C
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Solution
The correct option is D Both B and C A compound is a pure substance made up of two or more substances combined chemical in a definite (or constant) proportion by mass (or weight). When two or more elements combine chemically to form a new substance called a compound.