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Q1: Which strategy is an appropriate way for
Q4: Nonmetals have a shiny appearance,and they are
Q5: When a piece of magnesium (density =
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Q10: Bromine is abbreviated by the two-letter symbol
Q21: Gases expand to fill the volume and
Q24: Why do teachers use virtual conferences?<br>A)They are
Q27: What period 4 element forms an ion
Q60: When subtracting 15 from 762.85 the answer
Q96: In order to cause an endothermic equilibrium