1. Electrolysis ‘splitting up compounds using electricity’
Electrode – rod that conducts electricity – come in pairs – one negative and one positive.
Electrolyte – ionic liquid or solution broken down by electrolysis.

2. Opposites attract
Negative ions move to the positive electrode e.g. chloride.
Electrode – rod that conducts electricity – often made of graphite or platinum – they are inert.
Positive ions move to the negative electrode e.g. copper.

3. Don’t PANIC - Positive is Anode, Negative Is Cathode.

4. Electrolysis Prediction. What do you think is going to happen?
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Observation. What do you see? Record your results
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Conclusion. Can you explain what you have seen?
Copper Chloride solution
CuCl2(aq)

5. List the products of the electrolysis of these molten salts.
Anode (+)
Cathode (-)
Potassium Bromide
Aluminium Oxide
Barium Iodide
Sodium Chloride
Calcium Fluoride

6. List the products of the electrolysis of these molten salts.
Anode (+)
Cathode (-)
Potassium Bromide
Bromine
Potassium
Aluminium Oxide
Oxygen
Aluminium
Barium Iodide
Iodine
Barium
Sodium Chloride
Chlorine
Sodium
Calcium Fluoride
Fluorine
Calcium

7. For the current to flow in electrolysis, the ……………… must be able to ……………. between the electrodes. This can only happen if the substance is in …………….. or if it is ……………..
Wordbank: ions, molten, move, solution.
Predict the products formed at each electrode when the following compounds are melted and then electrolysed.
Zinc Iodide
Lithium Bromide
Iron (III) Fluoride
We can get aluminium from aluminium oxide by electrolysis.
Why can’t we get titanium from titanium dioxide by electrolysis?

8. For the current to flow in electrolysis, the ions must be able to move between the electrodes. This can only happen if the substance is in solution or if it is molten.
Wordbank: ions, molten, move, solution.
Predict the products formed at each electrode when the following compounds are melted and then electrolysed.
Zinc at cathode (-), Iodine at anode (+)
Lithium at cathode (-), Bromine at anode (+)
Iron at cathode (-), Fluorine at anode (+)
Aluminium oxide has ionic bonding but in titanium dioxide the bonds are covalent.