Electrolysis Flashcards
1
Q
state what happens to the positive ions in electrolysis
A
they go to the negative electrode (cathode) and are reduced (gain of electrons)
2
Q
state what happens to the negative ions in electrolysis
A
they go to the positive electrode (anode) and are oxidised (loss of electrons)
3
Q
why is cryolite added
A
to lower the melting point of a substance so less energy is required to break bonds
4
Q
explain why the positive electrode need to be continually replaced
A
oxide ions lose electrons at the positive electrodes and and are oxidised to oxygen gas: this reacts with carbon from the positive electrodes, creating carbon-dioxide
