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) ⟶  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 Chloride (aq) +Hydrogen (g).

Answer 1

(a) 2KBr + BaI₂ ⇾ 2KI + BaBr₂ 

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

(b) ZnCO₃(s) ⇾ ZnO(s) + CO₂(g) 

In this reaction, a single substance yields two different products. Hence, it is a decomposition reaction. 

(c) H₂(g) + Cl₂(g) ⇾ 2HCl(g) 

In this reaction, two different reactants react with each other to form a single product. Hence, it is a combination reaction. 

(d) Mg(s) + 2HCl (aq.) ⇾ MgCl₂(aq.) + H₂(g) 

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

Answer 2

a) 2KBr + BaI₂ → 2KI + BaBr₂

b) ZnCO₃ → ZnO + CO₂

c) H₂ + Cl₂ → 2HCl

d) Mg + 2HCl → MgCl₂ + H₂