Chemically, clean [nonpolluted] air is
A) a compound.
B) an element.
C) a liquid.
D) a mixture of different compounds.
E) an isotope.
Correct Answer:
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Q15: According to the philosophy of Democritus,
A) the
Q16: The number of atoms in the sulfuric
Q17: Air is composed mainly of
A) O2.
B) N2
Q18: The Greek model of the atom should
Q19: The idea that everything is made of
Q21: A "megawatt" is
A) 1000 watts.
B) 1,000,000 watts.
C)
Q22: Why is it so difficult to remove
Q23: Chemically, clean [non- polluted] air is
A) a
Q24: The length of your arm is closest
Q25: An individual oxygen atom has 16 times
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