In the equation 2 H2 + O2 → 2 H2O,?
A) only H2 and O2 are compounds.
B) only H2O is a compound.
C) H2, O2, and H2O are all compounds.
D) H2, O2, and H2O are all elements.
E) H2, O2, and H2O are all trace elements.
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B is the correct answer.
H and O alone are elements - pure and single components
H2 and O2 are molecules - two or more elements joined together
H2O is a compound and a molecule - compounds are two or more elements joined together
Trace elements is a general term usually meaning "in small amounts".
b is correct