The formula for ammonia, 
,represents a compound composed of
A) one atom of nickel and three atoms of hydrogen.
B) one atom of nitrogen and three atoms of hydrogen.
C) three atoms of nitrogen and three atoms of hydrogen.
D) three atoms of nitrogen and one atom of hydrogen.
E) one atom of nitrogen and three atoms of helium.
Correct Answer:
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Q20: Which of the following are states of
Q21: What is the chemical symbol for chlorine?
A)C
B)Ca
C)Cl
D)Cr
E)Cu
Q22: Vegetable oil is a(an)_,and is found in
Q23: List and describe two differences between pure
Q24: Each symbol denotes an element except
A)Co.
B)CO.
C)Cu.
D)C.
E)Cl.
Q26: What is the symbol for tungsten?
A)W
B)Tu
C)Sn
D)St
E)Ti
Q27: Which of the following is an element?
A)fire
B)iron
C)salt
D)water
E)wine
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
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