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If we have 2 groups with 2 characteristics each, what would our critical value be with an alpha of .025? This as well? How can I solve the following word problem? The density of solid Ag is 10.5 g/cm3. How many atoms are present per cubic centimeter of Ag? Equation shows the reaction between a halogen and aqueous bromide ions. X2 …1… + 2Br–(aq) → 2X–(aq) + …2…?