Question

6. Write one of the reaction for each of the following characteristics :

(f) Change of smell

Answer 1

Part 1: Chemical reaction

• A chemical reaction may take place when two or more reactants come in contact with one another resulting in the formation of new substances called products accompanied by the transfer of energy among them.

Part 2: Change of smell

• There are some chemical reactions that result in the change of smell.
• When sodium sulfide reacts with hydrochloric acid, it gives off a gas hydrogen sulfide, having the smell of rotten eggs.
• $\underset{\mathrm{Sodium}\mathrm{Sulfide}}{{\mathrm{Na}}_2\mathrm{S}\left(\mathrm{g}\right)}+\underset{\mathrm{Hydrochloric}\mathrm{acid}}{2\mathrm{HCl}\left(\mathrm{aq}\right)}\to \underset{\mathrm{Sodium}\mathrm{Chloride}}{2\mathrm{NaCl}\left(\mathrm{aq}\right)}+\underset{\mathrm{Hydrogen}\mathrm{Sulfide}}{{\mathrm{H}}_2\mathrm{S}\left(\mathrm{g}\right)}$