Chapter 19, Problem 1STP

To determine

Tochoose: the correct chemical equation for the reaction shown in the photograph among the options A) ${\text{H}}_{\text{2}}\text{O}\left(\text{l}\right)\to {\text{H}}_{\text{2}}\left(\text{g}\right)\text{+O}\left(\text{g}\right)$ , B) ${\text{H}}_{\text{2}}\text{O}\left(\text{l}\right)\to 2{\text{H}}_{\text{2}}\left(\text{g}\right)\text{+O}\left(\text{g}\right)$ , C) ${\text{2H}}_{\text{2}}\text{O}\left(\text{l}\right)\to 2{\text{H}}_{\text{2}}\left(\text{g}\right)\text{+2O}\left(\text{g}\right)$ , D) ${\text{2H}}_{\text{2}}\text{O}\left(\text{l}\right)\to 2{\text{H}}_{\text{2}}\left(\text{g}\right)\text{+2O}\left(\text{g}\right)$ .

Answer to Problem 1STP

The reaction is ${\text{2H}}_{\text{2}}\text{O}\left(\text{l}\right)\to 2{\text{H}}_{\text{2}}\left(\text{g}\right)\text{+2O}\left(\text{g}\right)$ .

Explanation of Solution

Introduction:

The diagram shown in the photograph is electrolysis of water. Water is a stable molecule. If an electric current is introduced, then it dissociate into oxygen and hydrogen.

The correct chemical equation for the reaction is

  ${\text{2H}}_{\text{2}}\text{O}\left(\text{l}\right)\to 2{\text{H}}_{\text{2}}\left(\text{g}\right)\text{+2O}\left(\text{g}\right)$

Hence, the correct option is (D).

Conclusion:

Hence,the reaction is ${\text{2H}}_{\text{2}}\text{O}\left(\text{l}\right)\to 2{\text{H}}_{\text{2}}\left(\text{g}\right)\text{+2O}\left(\text{g}\right)$ .