ELECTROLYSIS+NOTES

__**ELECTROLYSIS**__ The grey blob underneath the cathode is sodium being deposited. As sodium is a Na+ ion, it will be attracted to the Cathode- as this is negative. Also, as Sodium is a Na+ ions- it will need 1 electron in order for it to become a full outer shell. So the electron will go **TO** the Na+ ions **FROM** the Cathode, leaving sodium. This is called **REDUCTION**

The green gas given off is chlorine gas. As Chlorine is a Cl- ions it will be attracted to the anode- as this is positive. Also, as chlorine is a Cl- ion, it will need to lose an electron in order for it to become a full outer shell, and so become chlorine gas. So the electron **FROM** the cl- ions **TO** the anode, leaving chlorine. This is called **OXIDATION**. AS THE SAME AMOUNT OF ELECTRONS HAS STAYED IN THE CIRCUIT- ELECTROLYSIS WILL NOT STOP! __**AN EASY WAY TO REMEMBER OXIDATION AND REDUCTION IS:**__ **O** xidation **I** S A reaction that uses both reduction and oxidation is called a __**REDOX** **REACTION**__
 * L** ESS ELECTRONS
 * R** EDUCTION
 * I** S
 * G** AIN ELECTRONS
 * __HALF EQUATIONS __**To say what is happening at the electrodes(cathode and anode) we use half equations. They are called half equations because it is explaining what is happeining at each electrode separately and we need need to know what is happening at both electrodes to know what is happening in the whole reaction.

At the Negative electrode in the above diagram:



 This says that as the Sodium was given an electron through **REDUCTION**, sodium was formed.

 This says that the Chlorine ions was **OXIDATION**, it gave chlorine and one electron.#

JONATHAN AND JESSICA