Question

Which energy change occurs in an operating voltaic cell?

(1) chemical to electrical
(2) electrical to chemical
(3) chemical to nuclear
(4) nuclear to chemical

Answer 1

I believe its 1.chemical to electrical

Answer 2

Answer : The correct option is, (1) chemical to electrical

Explanation :

Voltaic cell : It is a device that is used for the conversion of the chemical energy produces in a redox reaction into the electrical energy.

For example : The redox reaction occurs between the zinc and copper sulfate.

In the voltaic cell, the oxidation occurs at an anode which is a negative electrode and the reduction occurs at the cathode which is a positive electrode.

The balanced two-half reactions will be,

Oxidation half reaction :
`Zn(s)\rightarrow Zn^(2+)(aq)+2e^-`

Reduction half reaction :
`Cu^(2+)(aq)+2e^-\rightarrow Cu(s)`

Thus the overall reaction will be,

`Zn(s)+Cu^(2+)(aq)\rightarrow Zn^(2+)(aq)+Cu(s)`

Hence, the correct option is, (1) chemical to electrical