### Chapter 1: Chemical reactions and equations

Q
##### Chemical reactions and equations

Question:

Write the balanced chemical equations for the following reactions:

(a) Calcium hydroxide + Carbon dioxide → Calcium carbonate + Water

(b) Zinc + Silver nitrate → Zinc nitrate + Silver

(c) Aluminium + Copper chloride → Aluminium chloride + Copper

(d) Barium chloride + Potassium sulphate → Barium sulphate + Potassium chloride

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

Ca(OH)2 + CO2 → CaCO3 + H2O

The number of atoms of different elements present in the given unbalanced equation is as follows: The number of atoms of each element is the same in reactant as in the product.

Therefore, the correct answer is Ca(OH)+ CO→ CaCO+ H2O.

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

Zn + AgNO3 → Zn(NO3)2 + Ag

The number of atoms of different elements present in the given unbalanced equation is as follows: First balance nitrogen by multiply 2 in the reactant side as shown below:

Zn + 2 AgNO3 → Zn(NO3)2 + Ag

Now, balance silver by multiply 2 in the product side as shown below:

Zn + 2 AgNO3 → Zn(NO3)2 + 2 Ag

The number of atoms of different elements present in the given balanced equation is as follows: Therefore, the correct answer is Zn + AgNO→ Zn(NO3)+ 2Ag.

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

Al + CuCl2 → AlCl3 + Cu

The number of atoms of different elements present in the given unbalanced equation is as follows: First balance chlorine by multiply 2 in the reactant side and 3 in the product side as shown below:

Al + 3 CuCl2 → 2 AlCl3 + Cu

Now, balance aluminium by multiply 2 in the reactant side as shown below:

2 Al + 3 CuCl2 → 2 AlCl3 + Cu

Similarly, balance copper by multiply 3 in the product side as shown below:

2 Al + 3 CuCl2 → 2 AlCl3 + 3 Cu

The number of atoms of different elements present in the given balanced equation is as follows: Therefore, the correct answer is 2Al + 3CuCl→ 2AlCl+ 3Cu.

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

BaCl2+ K2SO4 → BaSO4 + KCl

The number of atoms of different elements present in the given unbalanced equation is as follows: First, balance potassium by multiply 2 in the product side as shown below:

BaCl2+ K2SO4 → BaSO4 + 2 KCl

The number of atoms of different elements present in the given balanced equation is as follows: Therefore, the correct answer is BaCl+ K2SO→ BaSO+ 2KCl.

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