Question

8. Write the balanced chemical equation for the following and identify the type of reaction in each case.
(a) Potassium bromide(aq) + Barium iodideſaq) → Potassium iodide (aq) +Barium bromide(s)
(b) Zinc carbonate(s) → Zinc oxide(s) + Carbon dioxide(g)
(c) Hydrogen(g) + Chlorine(g) → Hydrogen chloride(g)
(d)Magnesium(s) + Hydrochloric acid(aq) → Magnesium chloridelag) + Hydrogenlg)​

Answer 1

Explanation:

(a) Potassium bromide(aq) + Barium iodide(aq) → Potassium iodide(aq) + Barium bromide(s)

2KBr (aq) +BaI 2(aq) →2KI (aq) +BaBr 2(s)

In this reaction, both the reactants exchanges ions to for two new products, hence, it is a double displacement reaction

(b) zinc carbonate(s) → Zinc oxide(s) + Carbon dioxide(g)

ZnCO 3(s) →ZnO (s) +CO 2(g)

In this reaction, a single substance yields two different product. hence, it is a decomposition reaction

(c) Hydrogen(g) + Chlorine(g) → Hydrogen chloride(g)

H 2(g) +Cl 2(g) →2HCl(g)

(d) Magnesium(s) + Hydrochloric acid(aq) → Magnesium chloride(aq) + Hydrogen(g)

Mg (s) +2HCl (aq) →MgCl 2(aq)+H2(g)

In this reaction, more reactive Mg is replacing less reactive H. Hence, it is displacement reaction