Problem: Which statement best describes a compound? a) A compound always contains a metal and a nonmetal. b) A compound has variable composition of atoms and molecules. c) A compound contains two or more elements in fixed atomic ratio. d) A compound cannot be broken down into simpler substances by chemical reactions.

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We are asked to determine the statement that best describes a compound.

Recall that mixtures are combinations of two or more pure substances (elements or compounds)

An element is a chemical substance that is made up of a particular kind of atom and cannot be broken down or transformed by a chemical reaction.

 A compound consists of two or more types of elements held together by covalent or ionic bonds.

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Problem Details

Which statement best describes a compound? 

a) A compound always contains a metal and a nonmetal. 

b) A compound has variable composition of atoms and molecules. 

c) A compound contains two or more elements in fixed atomic ratio. 

d) A compound cannot be broken down into simpler substances by chemical reactions.