Electrolysis Flashcards
An electrolyte is just a liquid or solution that can conduct what ?
Electricity
An electrode is a solid that is put ____ and conducts electricity
In the electrolyte
An electrode is a solid that is put in the electrolyte and ______
Conducts electricity
Electrolysis means ..
Splitting up with electricity
The electrodes need to be unreactive so that they ..
Don’t react with the electrolyte
Metals can be extracted from their ores using ______
Electrolysis
The anode is …
The positive electrode
The cathode is ….
The negative electrode
What does PANIC stand for ?
Positive anode negative is cathode
What does OILRIG stand for ?
Oxidisation is loosing reduction is gaining
Why is aluminium so expensive ?
Because it has a high melting point and takes up lots of energy to burn
What is aluminium mixed with to decrease costs and why ?
Cryolite , because it has a Lower melting point and is an aluminium compound
When electrolysing aluminium , what is it the container ??
A steel case coated in graphite , this is because graphite is an unreactive non metal AND doubles as a negative cathode
What is aluminiums melting point ?
Over 2000•c
What is aluminum oxide found in ?
Bauxite
What is attracted to the negative cathode when electrolysing aluminium oxide ?
Aluminium / Al3+
What forms at the anode ?
O2 , which ends up as carbon
Why do you have to replace the anode when electrolysing aluminium oxide ?
Because of the co2 , it wears down over time
What does aluminium contract well ?
Heat and electricity
What density does aluminium have ?
Low
Does aluminium corrode and why ?
No , because of the low density
What is aluminium useful for ?
Drink cans , electricity cables , airplains
Fill in the blank :
Electrolytes are ….. compounds
Ionic
In what state can an electrolyte be in ?
In molten state , or dissolved in water
Why must electrolytes be molten or dissolved ?
So that the ions are deee to move within the liquid or solution
Is the aluminium oxide ion positive or negative ?
Positive
Is the oxygen ion positive or negative ?
Negative
What does the anode form in the required practical ?
Gas
