Electrolyte – ionic liquid or solution broken down by electrolysis. Electrolysis ‘splitting up compounds using electricity’ Electrode – rod that conducts.

Electrolyte – ionic liquid or solution broken down by electrolysis.

Electrolysis‘splitting up compounds using electricity’

Electrode – rod that conducts electricity – come in pairs – one negative and one positive.

Opposites attract

Electrode – rod that conducts electricity – often made of graphite or platinum – they are inert.

Negative ions move to the positive electrode e.g. chloride.

Positive ions move to the negative electrode e.g. copper.

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

Electrolysis

Copper Chloride solution CuCl2(aq)

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?____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

Salt Anode (+) Cathode (-)

Potassium Bromide

Aluminium Oxide

Barium Iodide

Sodium Chloride

Calcium Fluoride

List the products of the electrolysis of these molten salts.

Salt Anode (+) Cathode (-)

Potassium Bromide Bromine Potassium

Aluminium Oxide Oxygen Aluminium

Barium Iodide Iodine Barium

Sodium Chloride Chlorine Sodium

Calcium Fluoride Fluorine Calcium

List the products of the electrolysis of these molten salts.

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.a)Zinc Iodideb)Lithium Bromidec)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.a)Zinc at cathode (-), Iodine at anode (+)b)Lithium at cathode (-), Bromine at anode (+)c)Iron at cathode (-), Fluorine at anode (+)

Aluminium oxide has ionic bonding but in titanium dioxide the bonds are covalent.