Which element is not essential for human life?
A) C
B) H
C) P
D) Pb
E) Ca
Correct Answer:
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Q31: Which symbol does not denote a compound?
A)
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Q34: A pure substance
A)always has the same elemental
Q35: The most common element by mass percent
Q37: What element is represented by the chemical
Q38: Which of the following observations demonstrates that
Q39: Of the elements listed,the most abundant by
Q40: The formula for sodium carbonate, Na2CO3
,represents a
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