SC5ii - ELECTROLYSIS Flashcards
electrolysis definition
the process of passing electricity through an electrolyte to split the electrolyte up into the elements it’s made from
electrolyte definition
an ionic compound either dissolved in solution or molten
electrode definition
the material used to supply electricity to the electrolyte (usually carbon or platinum)
positive ion
cation
negative ion
anion
positive electrode
anode
negative electrode
cathode
describe what happens to the ions during electrolysis
- positive ions (cations) travel to the negative electrode (cathode)
-negative ions (anions) travel to the positive electrode (anode) - at the electrodes chemical reactions happen which turn the ions back into atoms
oxidation is ____ of electrons
OILRIG
oxidation is LOSS of electrons
reduction is ____ of electrons
OILRIG
reduction is GAIN of electrons
the cathode ________ electrons
supplies
the anode _______ electrons
removes
electrolysis of copper sulphate using copper electrodes:
used for ?
used for purifying copper
if the anode is impure copper, the copper will transfer to the cathode as pure copper and in the process will lose its impurities
electrolysis of copper sulphate using copper electrodes:
the anode _________ in weight
copper is transferred from anode to cathode
-> anode DECREASES in weight
electrolysis of copper sulphate using copper electrodes:
the cathode _________ in weight
copper is transferred from anode to cathode
-> cathode increases in weight
