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chemistry unit 2 revision

meg coxhead

on 23 January 2013

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Transcript of electrolysis

Electrolysis unit 2 chemistry The positive
electrode is
cathode Reactivity affects
the products
formed by
electrolysis The negative
electrode is
the cathode +ve ions are attracted to
the -ve electrode . Here
they gain electrons.
reduction -ve ions are attracted
to the +ve electrode.
Here they lose
oxidation Cryolite electroplating The negative electrode
is the metal object
want to plate
and the positive
electrode is the
pure metal you
want it to be
plated with uses of electroplating
conduction (making things like copper conduct electricity well ) is used to lower the temperature and the costs.
it brings the temperature down which makes it cheaper and easier
the electrodes are made of carbon graphite
electrolysis means the splitting up with electricity
if you pass an electric current through an ionic substance that is molten . It breaks down into elements that it's made from.
oxidation is the loss of
one or more electrons Reduction is
the gain of
one or more electrons it requires a liquid to conduct the electricity called the electrolyte
electrolytes contain free ions
they 're usually the molten or dissolved ionic substance
in either case it's free ions which conduct the electricity and allow the whole thing to work
for the circuit to be complete there's got to be a flow of electrons
electrons are taken away from ions at the postive electode and given to toehr ions at the negative electrode. positive
2cl- - 2e- ---> cl2
half equations negative electrode
2h+ +2e- -----> h2 oxide ions are attracted
to the positive electrode
oxygen is formed here and oxide ions lose electrons the oxygen reacts with the carbon dioxide and carbon dioxide is formed at the positive electrode uses electrolysis to coat the surface with another metal aluminum is made by the electrolysis of aluminum oxide aluminum oxide is melted All the negative
electrode aluminum
is formed aluminum ions
are attracted to
negative electrode
Full transcript