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.
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.