________ are pure substances.
A) Homogeneous mixtures and elements
B) Elements and compounds
C) Heterogeneous mixtures and compounds
D) Homogeneous and heterogeneous compounds
Correct Answer:
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A)HF
B)Se
C)F₂
D)CO₂
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A)Na
B)K
C)S
D)Sm
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A)P
B)Po
C)Pu
D)K
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A)an atom
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