Question

By giving a reason state why chemical change takes place in the following case: Heating of ammonium chloride in a test tube.

Answer 1

• Chemical change: The process in which the composition of substance is completely altered and a new product is formed is called a chemical change.
• When the solution of ammonium chloride $\left({\mathrm{NH}}_4\mathrm{Cl}\right)$ is heated above the temperature of $340°\mathrm{C}$, it forms Ammonia $\left({\mathrm{NH}}_3\right)$ and Hydrogen Chloride $\left(\mathrm{HCl}\right)$. Hence it is a chemical change.

${\mathrm{NH}}_4\mathrm{Cl}\left(\mathrm{s}\right)\stackrel{∆}{\to }{\mathrm{NH}}_3\left(\mathrm{g}\right)+\mathrm{HCl}\left(\mathrm{g}\right)$