Topic 8-electrolysis

• Electrolysis is the decomposition of an ionic substance by electricity. The ionic substance needs to be molten or dissolved in a solution for electrolysis to happen as ions can move so conduct electricity
• the electrolyte is the substance that is being broken down, Li+,02- (drop and swap) electrolyte formula li2o
• Anion is a negative ion
• a metal that is found as an uncombined element in the earths crust is gold
• anode is the positively charged electrode, negative ions move towards the anode when they get there they lose electrons to form neutral atoms
• electrolysis in aqueous solution, at the cathode if the metal is below hydrogen the metal will be discharged, if the metal is above hydrogen then hydrogen gas will be discharged. At the anode if the ionic compound is a halide- halogen (chlorine, bromine, iodine) will be discharged , everything else oxygen gas discharged
• cathode is the negatively charged electrode, positive ions move towards the cathode when they get there they gain electrons to form neutral atoms
• electrolysis will happen if the metal is more reactive then carbon
• carbon extraction will happen if less reactive as carbon can then displace as it is more reactive
• cation is the positive ions
• the name that is given to rocks that contain metal compounds used in the extractions of metals is ore
• a metal conducts electricity as delocalised electrons are free to move
• it is safer to do electrolysis in a fume cupboard as chloride is a toxic gas
• oil rig stands for oxidation is loss, reduction is gain
• the two properties of aluminium that make it suitable for its use are that aluminium docent corrode, aluminium is malleable
• Ionic half equations