Electrolysis Flashcards
(24 cards)
What is electrolysis?
The process of a liquid (electrolyte) conducting electricity and this brings about a chemical change in the electrolyte.
the metal is produced at the cathode if it is ______
less reactive than hydrogen
hydrogen is produced at the cathode if the metal is ______
more reactive than hydrogen
What 3 elements are less reactive than hydrogen?
Copper, Silver and Gold
For the most common compounds, _____ is produced at the anode
oxygen
If halide ions are present, then _____, _____ or _____ is produced at the anode
chlorine, bromine or iodine
What is oxidation?
the loss of electrons
What is reduction?
the gain of electrons
Where does oxidation happen?
at the anode
Where does reduction happen?
at the cathode
OIL RIG
Oxidation Is Loss of electrons, Reduction Is Gain of electrons
What is the definition of inert?
chemically inactive
electrolyte
an ionic compound which can conduct electricity when it is molten or dissolved in water
What is the cathode?
the negative terminal
What is the anode?
the positive terminal
Where do the positive ions go?
to the cathode
Where do the negative ions go?
to the anode
What is the Magnesium half equation being reduced?
Mg²+ + 2e‐ -> Mg
What is the Chlorine half equation being oxidised?
2Cl‐ -> Cl² + 2e‐
What is the Hydrogen half equation being reduced?
2H+ + 2e‐ -> H²
What is the Oxygen half equation being oxidised?
2O²‐ -> 0² + 4e‐
What is Bauxite?
Al²O³
What does Cryolite do?
lowers the melting point of Bauxite
What happens to the graphite anodes in the extraction of Aluminium from Bauxite?
They get turned into CO²
