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Question

What do we call the substance which is composed of two or more elements, and chemically combined in a fixed ratio by mass?


A

Compound

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B

Ions

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C

Heterogeneous mixtures

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D

Homogeneous mixtures

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Solution

The correct option is A

Compound


Elements combine to form compounds. A compound called calcium carbonate with the formula CaCO3 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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