Chapter 1: Chemical reactions and equations

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Q
Chemical reactions and equations

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) + Chloride (g) → Hydrogen chloride (g)

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

Answer:

(a)-The chemical equation for the given reaction is written as:

KBr (aq) + BaI2 (aq) → KI (aq) + BaBr2 (s)

The number of atoms of different elements present in the given unbalanced equation is as follows:

First balance bromine by multiply 2 in the reactant side as shown below:

2 KBr (aq) + BaI2 (aq) → KI (aq) + BaBr2 (s)

Similarly, balance iodine by multiply 2 in the product side as shown below:

2 KBr (aq) + BaI2 (aq) → 2 KI (aq) + BaBr2 (s)

The number of atoms of different elements present in the given balanced equation is as follows:

Thus, the balanced reaction is 2KBr(aq)+BaI2(aq)→2KI(aq)+BaBr2(s).

In the given reaction, the exchange of potassium ion and barium ion takes place simultaneously to form potassium iodide and barium bromide. So, it is a double displacement reaction.

Thus, the correct answer is a double displacement reaction.

 

(b)-The chemical equation for the given reaction is written as:

ZnCO3 (s) → ZnO (s) + CO2 (g)

The number of atoms of different elements present in the given unbalanced equation is as follows:

The number of atoms of each element in the reactant is same as in product.

Thus, the balanced reaction is ZnCO3(s)→ZnO(s)+CO2(g).

In the given reaction, zinc carbonate is the single reactant that decomposes to form zinc oxide along with the evolution of carbon dioxide gas. This means that it is a decomposition reaction.

Thus, the correct answer is a decomposition reaction.

 

(c)-The chemical equation for the given reaction is written as:

H2 (g) + Cl2 (g) → HCl (g)

The number of atoms of different elements present in the given unbalanced equation is as follows:

Both hydrogen and chlorine are balanced by multiply 2 on the product side as shown below:

H2 (g) + Cl2 (g) → 2 HCl (g)

The number of atoms of different elements present in the given balanced equation is as follows:

Thus, the balanced reaction is H2(g)+Cl2(g)→2HCl(g).

In the given reaction, the hydrochloride is the single product that is formed from two reactants, that is hydrogen gas and chlorine gas. So, it is a combination reaction.

Thus, the correct answer is a combination reaction.

 

(d)-The chemical equation for the given reaction is written as:

Mg (s) + HCl (aq) → MgCl2 (aq) + H2 (g)

The number of atoms of different elements present in the given unbalanced equation is as follows:

First balance hydrogen by multiply 2 in the reactant side as shown below:

Mg (s) + 2 HCl (aq) → MgCl2 (aq) + H2 (g)

The number of atoms of different elements present in the given balanced equation is as follows:

Thus, the balanced reaction is Mg(s)+2HCl(aq)→MgCl2(aq)+H2(g).

In the given reaction, the magnesium is a reactive metal and it displaces hydrogen from the solution to form magnesium chloride and hydrogen gas. So, it is a displacement reaction.

Thus, the correct answer is a displacement reaction.


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