Question

which statement is true?
a) the smallest particle that makes up an element is a molecule.
b) pure compounds have the same composition regardless of where they are found or how they are made.
c) there are more elements than compounds.
d) all pure substances are elements.

Explanation:

• A: The smallest particle of an element is an atom, not a molecule.
• B: By definition, pure compounds have a fixed composition.
• C: There are far more compounds formed by combining elements than there are elements.
• D: Pure substances include both elements and compounds.

Answer:

B. Pure compounds have the same composition regardless of where they are found or how they are made.