How do these two substances compare? Explain.



A.Both substances are pure substances and can be classified as molecules. O2
is considered a compound, because it made up of two different elements, whereas H2O
is not a compound.


B.Both substances are pure substances and can be classified as molecules. H2O
is considered a compound, because it made up of two different elements, whereas O2

is not a compound.


C.Both substances are pure substances and can be classified as molecules. Each one is also considered a compound, because they have elements bonded together.


D.Both substances are pure substances and can be classified as molecules. Neither is called a compound because they have only one element in each molecule.