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You need to know the 3 rules for electrolysis then it’s easy to work out At the cathode Whether hydrogen or a metal is produced at the cathode depends on the position of the metal in the metal reactivity series: the metal is produced at the cathode if it is less reactive than hydrogen hydrogen is produced at the cathode if the metal is more reactive than hydrogen At the anode Oxygen is produced unless halide ions (chloride, bromide or iodide ions) are present. In that case, the negatively charged halide ions lose electrons and form the corresponding halogen (chlorine, bromine or iodine).
Electrolysis is the splitting of ionic substances using electric currents. The electric current causes the movement of positive and negative ions. Positive ions will travel to the negative electrode where they are reduced (gain electrons) and negative ions move to the positive electrode where they are oxidised (lose electrons).
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What is the best way to remember specific dates etc.. without making pneumonics?