Which square(s) contain(s) only an element? 
A) I only
B) II only
C) I and II only
D) III and IV only
Correct Answer:
Verified
Q11: Which substance is an element?
A)NO2
B)NaCl
C)N2
D)CH4
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A)pentoxygen diphosphide.
B)diphosphorus
Q41: During a chemical reaction,
A)atoms are rearranged.
B)some atoms
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Q45: Which diagram(s)best represent(s)only molecules? 
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