Flashcards in C4.3 Electrolysis Deck (21):
What is oxidation?
Loss of electrons
What is reduction?
Gain of electrons
What is the anode?
What is the cathode?
What is electrolyte?
An ionic substance which conducts electricity when molten or dissolved in water
What do metals ion attracted to?
They are positive and attracted to negative cathode- they undergo reduction
What are non-metals attracted to?
They are negatively charged and attracted to positive anode- they undergo oxidation
In the equation copper sulfato solution what would be produced at the negative electrode
At the cathode, copper would be produced as its ions are positive and opposites attract
In the equation copper sulfato solution what is produced at anode
At the positive electrode oxygen is produced as there’s no halogen available therefore oxygen is given off at positive electrode
What is produced at negative electrode in the equation of sodium sulfate solution
Hydrogen is produced instead of sodium as it’s more reactive than hydrogen
What is produced at positive electrode in the equation of sodium sulfate solution
Oxygen is produced as there’s no halogen available as it’s sulphur (sulphate) that’s available not chlorine (chloride)
What must copper be for electrical wiring
Pure- only by electrolysis
Disadvantage of electrolysis
Expensive due to large cost of electricity as a huge current is required for it to take place
What are insert electrodes
Electrodes that themselves are not involved in reaction
What is electrolysis
The breaking up of a substance using electricity
What must a substance be for electrolysis to happen
What affects the mass of solid products and the volume of gas produced
The higher the current and the longer it’s flowing for, the greater amount of electrolysis products you’ll get
What is the half equation for reduction e.g. copper ions
Cu +2e ->Cu
What is the half equation for reduction when hydrogen is involved (H-H (diatomic gas))
2H +2e ->H2
What is the half equation for oxidation e.g. chlorine ions
2Cl -> Cl2 + 2e