1) Chemical Changes- Electrolysis Flashcards
what are electrolytes?
ionic compounds in the molten state or dissolved in water
what is electrolysis?
process in which electrical energy from a direct current supply, decomposes electrolytes
what does PANIC stand for?
positive anode, negative cathode
what happens to the positive cations in electrolysis?
positively charged cations migrate to negatively charged cathode
what happens to the negatively charged anions in electrolysis?
negatively charged anions migrate to the positively charged anode
what is the formation of copper chloride solution during electrolysis?
copper, cathode
chlorine, anode
what is the formation of sodium chloride solution during electrolysis?
sodium, cathode
chloride, anode
what is the formation of sodium sulphate solution during electrolysis?
hydrogen, cathode
oxygen, anode
what is the formation of water acidified with sulphuric acid during electrolysis?
hydrogen, cathode
oxygen, anode
what is the formation of molten lead bromide during electrolysis?
lead, cathode
bromide, anode
HALF EQUATIONS
HALF EQUATIONS
what is oxidation?
loss of electrons
what is reduction?
gain of electrons
where do oxidation and reduction occur?
reduction occurs at the cathode and oxidation occurs at the anode
what is the formation of copper sulphate during electrolysis?
- copper metal formed at the cathode
- oxygen and water produced at anode
- leaving pure copper
