Tuesday, January 18, 2011

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!!!!!!!!!

 

Monday, January 17, 2011

...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).

WHAT IS ELECTROCHEMISTRY?



An electrochemical cell is a device capable of either deriving electrical energy from chemical reactions, or facilitating chemical reactions through the introduction of electrical energy. A common example of an electrochemical cell is a standard 1.5-volt "battery".