Flashcards in Electrolysis Deck (9)
what are anions, cations, anodes and cathodes? (4 points)
anions: negatively charged ions
cations: positively charged ions
cathode: attracts cathodes (-ve electrode)
anode: attracts anodes (+ve electrodes) [gives out electrons)
what is electrolysis? (1 point)
it is process of using electricity to break down or decompose a compound
3 main points on electrolysis?
contains a pair of electrodes connected to the battery, usually dipped in an electrolyte.
electrical energy --> chemical energy
why cant solid electrolytes be used? (2 point)
In the solid state, ions are held in the lattice structure. Thus, they cannot conduct electricity as there are no mobile ions or electrons. (non electrolytes: sulfur, sugar, distilled water, organic compounds, e.g. ethanol)
what happens at the cathode and anode respectively (2 points; hint: oxidation)
at the anode, oxidation takes place. at the cathode, reduction takes place. (Oh A Red Cat)
differences between molten electrolytes and aqueous electrolyte. (2 points)
molten electrolytes are pure liquid that only have cations and anions in the liquid.
aqueous electrolytes contains water, made out of cations, anions, H+ and OH-
what is the preferential discharge of anions?
sulfur, nitrate, Cl, Br, I, OH- (OH- lose electrons most readily, usually the one getting discharged)
what is the preferential discharge of cations?
reactivity series (Au most likely to get discharged)