A balanced chemical equation is

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Problem

A balanced chemical equation is Zn(s)+2 HCl(aq)→Zn2+(aq)+2 Cl−(aq)+H2(g)Zn(s) + 2\,HCl(aq) \rightarrow Zn^{2+}(aq) + 2\,Cl^{-}(aq) + H_{2}(g). A particulate diagram of the mixture after the reaction shows Zn2+Zn^{2+} ions and Cl−Cl^{-} ions dispersed in water but omits any other species. Which additional species must be present in the diagram for it to be consistent with the balanced equation? (a) Cl2(g)\text{Cl}_{2}(g) molecules (b) H+(aq)\text{H}^{+}(aq) ions (c) H2(g)\text{H}_{2}(g) molecules (d) ZnCl2(s)\text{ZnCl}_{2}(s) units

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