electrolysis first lesson
TRANSCRIPT
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Today
Re capping the work
so far
Starting a C grade
topic
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Have you all got ..
A level ladder sheet in the front ofbooks
A year 11 explained leaflet
A green sheet stuck on the front ofyour books
Homework task sheet
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Look at the homework sheet
Draw and explain the structure ofHydrogen chloride . Why does this gashave a very low boiling point?
Must be done by
Thursday 5thNovember
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I understand.
I know about. I think I am grade A
at ..
The one thing Ireally enjoyedlearning about was.
I really enjoyed.
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Electrolysis is splitting upsubstances using
electricity
(Lysis is latin for splitting)
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What is electrolysis?
Electric current is used tobreakdown a substance made
up of ions
An electrolyte is the name forthe substance being broken
down
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Electrolysis set up
Cathode(-ve electrode)
Anode(+ve electrode)
Electrolyte: thisis what will beelectrolysed
d.c. powersupply
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Positive
Anode
Negative
Is
Cathode
Dont get stressed
in the exam:Remember PANIC
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Learning check in
Write down2 things you
have learntso far this
lesson
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Electrolysis of Molten NaCl
+ -
-+
CATHODEANODE
Na+
Cl-
Na+
Cl-
Na+
Cl-Na+
Cl-
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+ -
Zn+
Zn+Zn+
Zn+Zn+
Zn+
Zn+
Cl-
Cl-
Cl-
Cl-
Cl- Cl-
Cl-
Cl-
Zn+
positive electrode
(anode)
negative electrode(cathode)
molten zincchloride (ions free
to move)
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+ -
Zn+
Zn+
Zn+
Zn+
Cl-
Cl-
Cl-
Cl-
Cl-
Zn+
The negativelycharged
chloride ions
are attracted tothe positiveelectrode
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Compound Anode Cathode
SodiumBromide
PotassiumIodide
CalciumFluoride
MagnesiumOxide
LithiumChloride
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Anod
e
Catho
de
= bromide ion
= lead ion
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O.I.L.R.I.G.Oxidation is loss
of electrons
Reduction is gainof electrons
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Anod
e
Catho
de
= bromide ion
= lead ion
At the cathode:Pb+ gains electrons to form
lead metal.
It is REDUCED.
At the anode:Br- loses electrons to formbromine gas.
It is OXIDISED.
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Cathode
Negative
Anode
Positive
Positive ions
attracted
Negative ions
attracted
REDUCTIONhappens here (
positive ions gainelectrons)
OXIDATIONhappens here
(negative ionslose electrons
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Stand up sit down
1. One person names a topic.2. All pupils write a key word to do with the
topic on a whiteboard3. The person who chose the topic has 30
seconds to name as many key words to dowith the topic as they can.4. If the word the pupil has written down is
said they have to sit down.
5. The aim for the topic chooser is to geteveryone to sit down.6. The aim for the pupils writing down a word
is to out fox the topic chooser with arelevant but obscure word.
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