Xylene,a compound with the formula C8H10,is composed of
A) any combination of atoms of carbon and hydrogen in a four to five ratio.
B) eight atoms of carbon and ten atoms of hydrogen.
C) eight atoms of calcium and ten atoms of helium.
D) ten atoms of carbon and eight atoms of hydrogen.
E) any combination of atoms of carbon and hydrogen that add up to 18 total.
Correct Answer:
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Q28: What is the chemical symbol for calcium?
A)C
B)Ca
C)Cl
D)Cr
E)Cu
Q29: Which of the following can be classified
Q30: Which of the following is a mixture?
A)cough
Q31: Which symbol does not denote a compound?
A)
Q32: A reddish powder is heated gently in
Q34: A pure substance
A)always has the same elemental
Q35: The most common element by mass percent
Q36: Which element is not essential for human
Q37: What element is represented by the chemical
Q38: Which of the following observations demonstrates that
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