Electrolysis ‘splitting up compounds using electricity’

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Presentation transcript:

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.

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.

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

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

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

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

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?

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.