Question

Write a balanced chemical equation with the help of chemical symbols and formulas for the following reactions
a. $\rm{Calcium\,hydroxide + carbon\,dioxide \to calcium\,carbonate + water}$
b. $\rm{ Zinc + silver\,nitrate \to Zinc \,nitrate + silver}$
c. $\rm{Aluminium + Copper \,chloride \to Aluminium\,chloride + copper}$
d. $\rm{Barium\,chloride + potassium\,sulphate \to Barium\,sulphate + potassium\, chloride}$

Answer 1

The chemical equation is defined as the symbolic representation of compounds by their chemical formula. The entities present on the left side are called reactants and the entities present on the right side are called products. The number of atoms needs to be the same on both reactants and products side other than hydrogen and oxygen to balance the given equation.

Complete answer:
We know that for a balanced chemical, the total number of atoms present on the left side of reactants is equal to the total number of atoms on the right side of the products side.
a. So for the first reaction of calcium hydroxide$(\rm{Ca({OH}_2)})$ with carbon dioxide$(\rm{C{O_2}})$, we write the balanced chemical equation in the following way.
The balanced chemical equation is as follows
$\rm{Ca({OH}_2) + C{O_2} \to CaC{O_3} + {H_2}O}$
There are two atoms other than hydrogen and oxygen calcium and carbon and they are equal.
b. Coming to the second reaction we have the reaction of zinc$(\rm{Zn})$ with silver nitrate$(\rm{AgN{O_3}})$
The balanced chemical equation is as follows
$\rm{Zn + 2AgN{O_3} \to Zn({N{O_3})_2} + 2Ag}$
where Zn and Ag are chemical symbols of zinc and silver respectively
c. We have the next reaction as the reaction of aluminium$(\rm{Al})$ with copper chloride$(\rm{CuC{l_2}})$
The balanced chemical equation is as follows
$\rm{2Al + 3CuC{l_2} \to 2AlC{l_3} + 2Cu}$
where Al, Cu are the chemical symbols of aluminium and copper respectively
d. We have the next reaction as the reaction of barium chloride$(\rm{BaC{l_2}})$ with potassium sulphate$(\rm{{K_2}S{O_4}})$
The balanced chemical equation is as follows
$\rm{BaC{l_2} + {K_2}S{O_4} \to BaS{O_4} + 2KCl }$

Note:
The balancing of the chemical equation is based on the law of conservation of mass. It states that mass can neither be created nor be destroyed. It is of utmost importance to balance a chemical equation only we should remember that the number and mass of atoms on the reactants side should be equal to those on the products side.