Electroylsis - C6 Flashcards
What is electrolysis
It is the breaking down of a compound using electrical energy
What is the name of the compound being broken down
electrolyte
What is the cathode
It is the negative electrode
What is the anode
It is the positive electrode
What is the name of the positive ion
the cation
What is the name of the negative ion
Anion
What does PANIC stand for
Positive Anode Negative Is Cathode
What state does the electrolyte have to be in
Molten or in solution
How is electrolysis used in industry
It is used to extract useful elements from their ores
What does OILRIG stand for
Oxidation Is Loss Reduction Is Gain
What type of ion forms at the cathode when the electrolyte is molten
positive metal ion
What type of ion forms at the anode when the electrolyte is molten
Negative non-metal ion
What is the test for chlorine
Chlorine bleaches damp blue litmus paper, it goes red first
What is the test for oxygen
Relighting a burning splint
What is the test for hydrogen
Squeaky pop test
What is alumina
Aluminium oxide
How is aluminium extracted
Electrolysis
What is the name of the ore that alumina is taken from
Bauxite
Why is alumina dissolved in cryolite
So it conducts electricity and lowers the melting point
What are the uses of aluminium
Cans
Air plane chassis
Cooking foil
What ions are always formed when the electrolyte is a solution
H+ and OH-
What is the rule at the cathode when the electrolyte is a solution
If the metal ion in solution is less reactive than hydrogen, the metal will form
But if the metal ion is more reactive than hydrogen, the hydrogen will be formed
What is the rule at the anode when the electrolyte is a solution
If a halide ion (Group 7) is present, the halogen is formed
But if there is no halide ion present, the hydroxide ion is discharged and oxygen is formed
