Electrolysis powerpoint

Electrolysis…read more

Electrolysis
· Process using electricity to break down
ionic compounds into elements
· Electricity passed through a molten ionic
compound
· The substance broken down =
electrolyte
· The electric circuit has two electrodes
· Electrodes often made of an inert
substance so it does not react with
products…read more

Electrolysis
· The positve electrode is called the anode
· The negative electrode is called the
cathode
· The ions in the electrolyte move to the
electrodes where they are discharged to
produce elements…read more

Electrolysis of Lead Bromide
· Lead bromide Lead + Bromine
· Positive ions attracted to cathode where
they form metals or hydrogen depending on
ions
· Negative ions attracted to anode where they
lose their charge to form non metallic…read more

O Changes at the electrode
I · Oxidation is loss of electrons
· Reduction is gain of electrons
L · At anode, negative ions lose
electrons (this is oxidation)
R · Represent changes at electrodes
using half equations
I
G…read more

Aqueous Solutions
· Water contains hydrogen ions, H+, and
hydroxide ions, OH-
· Hydrogen is produced at the cathode if
the other positive ions are more reactive
than hydrogen
· Oxygen is usually produced at the anode.
However if solution contains a halide
ion, a halogen will be produced…read more