## Chemistry and Chemical Reactivity (9th Edition)

a) Balanced equation $Zn(s)+2\ HCl(aq)\rightarrow H_2(g)+ZnCl_2(aq)$ Net ionic equation: $Zn(s)+2\ H_3O^+(aq)\rightarrow H_2(g)+Zn^{2+}(aq)+H_2O(l)$ b) Balanced equation $Mg(OH)_2(s)+2\ HCl(aq)\rightarrow 2\ H_2O(l)+MgCl_2(aq)$ Net ionic equation: $Mg(OH)_2(s)+2\ H_3O^+(aq)\rightarrow Mg^{2+}(aq)+4\ H_2O(l)$ c) Balanced equation $CaCO_3(s)+2\ HNO_3(aq)\rightarrow H_2O(l)+CO_2(g)+Ca(NO_3)_2(aq)$ Net ionic equation: $CaCO_3(s)+2\ H_3O^+(aq)\rightarrow Ca^{2+}(aq)+3\ H_2O(l)+CO_2(g)$ d) Balanced equation $(NH_4)_2S(aq)+FeCl_2(aq)\rightarrow 2\ NH_4Cl(aq)+FeS(s)$ Net ionic equation: $S^{2-}(aq)+ Fe^{2+}(aq)\rightarrow FeS(s)$