Question

Balance the following equations.
$\mathrm{Ca}+{\mathrm{O}}_2\to \mathrm{CaO}$

Answer 1

Balanced chemical equation -

• A chemical equation is said to be balanced if the number of atoms of each element on the left-hand side is equal to the number of atoms present on the right-hand side.
• In order to balance a chemical equation, it is required to know what are reactants that are taking part in a chemical reaction and what are products will be formed.

Balancing a chemical equation-

Using Hit by trial method

$\mathrm{Ca}+{\mathrm{O}}_2\to \mathrm{CaO}$

Elements	Number of atoms on reactant side	Number of atoms on product side
Ca	1	1
O	2	1

1. To balance O, put coefficient 2 on the right-hand side. $\mathrm{Ca}+{\mathrm{O}}_2\to 2\mathrm{CaO}$
2. On doing the above step, balance the Ca by multiplying 2 on the left side $2\mathrm{Ca}+{\mathrm{O}}_2\to 2\mathrm{CaO}$
3. Hence, the balanced chemical equation is $2\mathrm{Ca}+{\mathrm{O}}_2\to 2\mathrm{CaO}$