Question

B. Statements given below are incorrect. Write the correct statements :

2. A balanced chemical equation consists of formulae of reactants connected by a (+) plus sign and is equal to (=) followed by the formulae of products, connected by the (+) plus sign.

Answer 1

• An equation in which the number of each atom of an element on the reactants side is equal to the number of each atom of an element on the product side is called a balanced equation.
• An unbalanced equation, as shown here

${\mathrm{H}}_2+{\mathrm{O}}_2\to {\mathrm{H}}_2\mathrm{O}$

• Notice that there are unequal numbers of each type of atom on the left-hand side compared with the right-hand side.
• To make them equal, we need to adjust the number of atoms of some of the substances until we get equal numbers of each type of atom on both sides.
• Therefore, the balanced equation will be:

$\underset{\mathrm{Hydrogen}\mathrm{gas}}{2{\mathrm{H}}_2\left(\mathrm{g}\right)}+\underset{\mathrm{Oxygen}\mathrm{gas}}{{\mathrm{O}}_2\left(\mathrm{g}\right)}\to \underset{\mathrm{Water}}{2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)}$

Correct statement: A balanced chemical equation consists of formulae of reactants connected by a (+) plus sign and is equal to (=) followed by the formulae of products, connected by the (+) plus sign. In both reactants and products, the number of atoms of a given element is equal.