Suppose that a particular chemical substance A is "pure" [contains no "impurities"], and that it can be chemically decomposed into two other pure materials B and C. What conclusion can be draw from this?
A) B and C must be elements.
B) A must be a chemical compound.
C) A must be an element.
D) B and C must be chemical compounds.
E) Nonsense--it is impossible to decompose a pure substance into two other materials.
B
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