Question

By giving a reason state why chemical change takes place in the following case:

Blackening of silver ware

Answer 1

• In the blackening of silver ware silver reacts with hydrogen sulphide gas and gets blackened and a new product silver sulphide is formed.
• So there is a new product formed.

$\underset{\mathrm{silver}}{2\mathrm{Ag}(\mathrm{s}})+\underset{\mathrm{hydrogen}\mathrm{sulphide}\mathrm{gas}}{{\mathrm{H}}_2\mathrm{S}\left(\mathrm{g}\right)}\to \underset{\mathrm{black}\mathrm{silver}\mathrm{sulphide}}{{\mathrm{Ag}}_2\mathrm{S}\left(\mathrm{s}\right)}+{\mathrm{H}}_2(\mathrm{g})$

• Hence it is a chemical change.