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Q2: What type of curve should be used
Q15: What is the identity of element Q
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Q24: In a chemical equation,Δ above the yield
Q57: Which one of the following contains 39%
Q60: How many significant figures are there in
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Q102: Groups,or families,on the periodic table are:<br>A)vertical columns
Q107: The formula of barium nitride is _.<br>A)Ba<sub>3</sub>N<sub>2</sub><br>B)Ba<sub>2</sub>N<sub>2</sub><br>C)BaN<br>D)Ba<sub>2</sub>N