Question

Write the balanced chemical equation for the following chemical reactions:

$$\begin{gathered} \mathrm{a}.\mathrm{Hydrogen}+\mathrm{Chlorine}\to \mathrm{Hydrogen}\mathrm{chloride} \\ \mathrm{b}.\mathrm{Lead}+\mathrm{copper}\mathrm{chloride}\to \mathrm{Lead}\mathrm{chloride}+\mathrm{Copper} \\ \mathrm{c}.\mathrm{Zinc}\mathrm{oxide}+\mathrm{Carbon}\to \mathrm{Zinc}+\mathrm{Carbon}\mathrm{monoxide} \end{gathered}$$

Answer 1

The chemical equation is said to be balanced if the number of atoms of all the molecules is equal on both sides of the equation.

Need of balancing the chemical equation:

Chemical equations need to be balanced in order to satisfy the law of conservation of matter which states that matter neither be created nor be destroyed in a closed system.

Balanced chemical equations of the above chemical reactions are given below :

$$\begin{gathered} \mathrm{a}.{\mathrm{H}}_2\left(\mathrm{g}\right)+{\mathrm{Cl}}_2\left(\mathrm{g}\right)\stackrel{\mathrm{heat}}{\to }2\mathrm{HCl}\left(\mathrm{g}\right) \\ \mathrm{b}.\mathrm{Pb}\left(\mathrm{s}\right)+{\mathrm{CuCl}}_2\left(\mathrm{aq}\right)\to {\mathrm{PbCl}}_2\left(\mathrm{aq}\right)+\mathrm{Cu}\left(\mathrm{s}\right) \\ \mathrm{c}.\mathrm{ZnO}\left(\mathrm{s}\right)+\mathrm{C}\left(\mathrm{s}\right)\stackrel{\mathrm{heat}}{\to }\mathrm{Zn}\left(\mathrm{g}\right)+\mathrm{CO}\left(\mathrm{g}\right) \end{gathered}$$

Hence, above mentioned chemical reactions are balanced chemical reactions.