Question.
Write the balanced chemical equation for the following and identify the type of reaction in each case.
(a) Potassium bromide(aq) $+$ Barium iodide(aq) $\rightarrow$ Potassium iodide(aq) $+$ Barium bromide(s)
(b) Zinc carbonate(s) $\rightarrow$ Zinc oxide(s) + Carbon dioxide(g)
(c) Hydrogen $(\mathrm{g})+$ Chlorine $(\mathrm{g}) \rightarrow$ Hydrogen chloride $(\mathrm{g})$
(d) Magnesium(s) + Hydrochloric acid(aq) $\rightarrow$ Magnesium chloride(aq) $+$ Hydrogen(g)
Write the balanced chemical equation for the following and identify the type of reaction in each case.
(a) Potassium bromide(aq) $+$ Barium iodide(aq) $\rightarrow$ Potassium iodide(aq) $+$ Barium bromide(s)
(b) Zinc carbonate(s) $\rightarrow$ Zinc oxide(s) + Carbon dioxide(g)
(c) Hydrogen $(\mathrm{g})+$ Chlorine $(\mathrm{g}) \rightarrow$ Hydrogen chloride $(\mathrm{g})$
(d) Magnesium(s) + Hydrochloric acid(aq) $\rightarrow$ Magnesium chloride(aq) $+$ Hydrogen(g)
solution:
(a) $2 \mathrm{KBr}(\mathrm{aq})+\mathrm{BaI}_{2}(\mathrm{aq}) \rightarrow 2 \mathrm{KI}(\mathrm{aq})+\mathrm{BaBr}_{2}(\mathrm{~s})$; Double displacement reaction
(b) $\mathrm{ZnCO}_{3}(\mathrm{~s}) \rightarrow \mathrm{ZnO}(\mathrm{s})+\mathrm{CO},(\mathrm{g}) ;$ Decomposition reaction
(c) $\mathrm{H}_{2}(\mathrm{~g})+\mathrm{Cl}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{HCl}(\mathrm{g})$; Combination reaction
(d) $\mathrm{Mg}(\mathrm{s})+2 \mathrm{HCl}(\mathrm{aq}) \rightarrow \mathrm{MgCl}_{2}(\mathrm{aq})+\mathrm{H}_{2}(\mathrm{~g})$; Displacement reaction
(a) $2 \mathrm{KBr}(\mathrm{aq})+\mathrm{BaI}_{2}(\mathrm{aq}) \rightarrow 2 \mathrm{KI}(\mathrm{aq})+\mathrm{BaBr}_{2}(\mathrm{~s})$; Double displacement reaction
(b) $\mathrm{ZnCO}_{3}(\mathrm{~s}) \rightarrow \mathrm{ZnO}(\mathrm{s})+\mathrm{CO},(\mathrm{g}) ;$ Decomposition reaction
(c) $\mathrm{H}_{2}(\mathrm{~g})+\mathrm{Cl}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{HCl}(\mathrm{g})$; Combination reaction
(d) $\mathrm{Mg}(\mathrm{s})+2 \mathrm{HCl}(\mathrm{aq}) \rightarrow \mathrm{MgCl}_{2}(\mathrm{aq})+\mathrm{H}_{2}(\mathrm{~g})$; Displacement reaction