1. Electrolysis

2. Learning Objectives By the end of the lesson I will be able to:
1) Understand the process of electrolysis.
2) Explain how we can use electrolysis to extract aluminium from its ore.

3. Electrolytes contain positive and negative ions.
During electrolysis, positive and negative electrodes are put into the electrolyte.
The positive electrode is called the anode.
The negative electrode is called the cathode.
The negative ions (called anions) are attracted to the anode.
At the anode, the negative ions lose electrons to become atoms/molecules.
The positive ions (called cations) are attracted to the cathode.
At the cathode, the positive ions gain electrons to become atoms/molecules

4. Cations move to cathode
An Electrolytic Cell e- e-
Bubbles of gas formed
ANODE
(+)
CATHODE
(-) X X M+
MOLTEN SALT or
SALT SOLUTION M+ M
Layer of metal formed M X- M+ M X- X-
Anions move to anode
Cations move to cathode

5. Match up the words with their descriptions
The substance being broken down
Test for Oxygen
Positive electrode
Test for Hydrogen
Makes a ‘popping’ noise when lit
Electrolyte
Splitting a substance using electricity
Anode
Relights a glowing splint
Cathode
Negative electrode
Anion
Positive ion
Cation
Negative ion
Electrolysis

6. Match up the words with their descriptions
The substance being broken down
Test for Oxygen
Positive electrode
Test for Hydrogen
Makes a ‘popping’ noise when lit
Electrolyte
Splitting a substance using electricity
Anode
Relights a glowing splint
Cathode
Negative electrode
Anion
Positive ion
Cation
Negative ion
Electrolysis

7. Electrolysis is splitting up substances using electricity
(Lysis is latin for splitting)

8. What is electrolysis?
Electric current is used to breakdown a substance made up of ions
An electrolyte is the name for the substance being broken down

9. Positive Anode Negative Is Cathode Don’t get stressed in the exam:
Remember PANIC

10. Remember! Cations are Pussitive
Positive Cat Eye-on
Cations move towards the Cathode.
The Cathode is where the Cations gain more electrons.
Electrons flow towards the positive ions (because of mewtual attraction.)
Cations CaRe
(Cathode Reduction)
ANegativeION

11. Electrolysis of Molten NaCl- +
ANODE
CATHODE
The metal goes to the cathode and the non metal goes to the anode. - +
Na+
Cl-
Cl-
Cl-
Na+
Na+
Na+
Cl-

12. Compound
Anode
Cathode
Sodium Bromide
Potassium Iodide
Calcium Fluoride
Magnesium Oxide
Lithium Chloride

13. By the end of this lesson you should:
Complete the electrolysis of copper sulphate.
Begin an explaination showing how electrolysis happens. Could be PowerPoint, flicker book, rap, song, smart phone animation app, stop-motion (see: )...be creative.