Construction of an Electrochemical Cell

Let us use the redox reaction given below to explain the construction of an Electrochemical Cell.

Zn (Solid) + CuSO₄ (Aqueous)   ZnSO₄ (Aqueous) + Cu (Solid)

The ionic form of the reaction is:

Zn + Cu²⁺    Zn²⁺ + Cu

This reaction can be split into the following two half reactions.

1. Oxidation half reaction

Zn  Zn²⁺ + 2e^-

2. Reduction half reaction

Cu²⁺ + 2e^-  Cu

Electrochemical or Galvanic or Voltaic Cells

An Electrochemical Cell is a device used to convert chemical energy (produced in a redox reaction) into electrical energy.

Electrochemical Cells are also known as Galvanic or Voltaic Cells.

If we take a zinc rod and place it in a container filled with copper sulphate solution heat will be produced. This happens due a spontaneous redox reaction given below:

Zn(Solid) + CuSO₄(Aqueous)  ZnSO₄(Aqueous) + Cu (Solid) deposited

As the reaction would proceed the zinc rod would get eroded ,copper particles would get deposited and solution would becom warm

.

It would be useful to be able to convert this chemical energy to electrical energy instead of heat energy. This is done by an electrochemical cell.

ELECTROLYTIC CELL

An electrolytic cell decomposes chemical compounds by means of electrical energy, in a process called electrolysis; the Greek word lysis means to break up.

electrolysis is to decompose a compound to its elements.

How To Make Lemon Battery?

Did you know when we study about electrochemistry we can apply it to make a lemon battery....but how to make it?this video will show you the way.....just click the start button then good luck!!!!!!!!!

 

...VOLTAIC CELL / GALVANIC CELL....

How Does The Galvanic Cell Work?

this example is using.........

anode electrode - zinc metal

cathode electrode - copper metal

salt  bridge - KCl (aq)

ELECTROCHEMICAL

Electrochemical Cells

1. Voltaic cell

-use spontaneous reation to generate electrical energy 

-system does not work on sourroundings.

2. Ectrolytic cell

-uses electrical energy to drive non spontaneous reaction

-sourrounding do work on system

Oxidation?...Reduction?.....Redox Reaction?.....

oxidation - the loss of electons by species, accompanied by increase in oxidation number.


reduction - the gain of electrons by a spesies,accompanied by a decrease in oxidation number.

redox reaction - a process in which there is no net movement of electrons from one reactant (reducing agent) to another (oxidizing agent).