Note that your final mark will not be saved in the system.
Electrolysis Typeit
Type the correct answers into the spaces. Fill all the spaces before clicking ‘Check Answers!’
In electrolysis, an ionic compound is melted or dissolved in water to allow ions to move freely in the . An electric current is supplied, which causes ions to move to the cathode and ions to move to the anode to be discharged and form pure . The electrodes used for molten ionic compounds must be so that they do not react with the electrolyte or any products.
Electrolysis can be used to metals such as aluminium from their oxides. This is usually done if the metal in question is more reactive than or reacts with , so reduction cannot be used. However, as a process it requires a lot of to produce an electrical current and to melt the compounds involved, so may be added to create a molten mixture which is usable at a lower temperature.
When electrolysis occurs in aqueous solutions, the ions that are discharged are determined by the relative of their elements. Water molecules are ionised in solution to form hydrogen ions and ions, which adds to the selection of ions present in solution. If a very reactive metal is used, the less reactive will form at the cathode. Oxygen is usually produced at the anode, except when ions are present, in which case a halogen is produced.