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Chemistry
Electrolysis Part 1
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Cards (21)
What is the main topic of today's video?
Electrolysis
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What does electrolysis allow us to do with ionic compounds?
Separate the
elements
in
insoluble
ionic compounds
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What is an electrolyte?
A liquid or solution containing
ionic compounds
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Why must the ions in the electrolyte be free to move?
To allow for the
conduction
of electricity
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How would you prepare an electrolyte from copper sulfate?
Dissolve
it in water
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What must be done to lead bromide to use it in electrolysis?
It must be melted to become
molten
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What ions are present in molten lead bromide?
Positive
lead ions and
negative
bromide ions
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What are the electrodes made of?
Metal
or
carbon
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What is the positive electrode called?
Anode
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What is the negative electrode called?
Cathode
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Why do we need a power supply in electrolysis?
To drive the flow of
electrons
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What does the term electrolysis literally mean?
Splitting
up
with
electricity
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What happens to bromide ions at the anode?
They are oxidized to form
bromine gas
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What is produced when bromide ions are discharged?
Bromine gas
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What happens to lead ions at the cathode?
They are
reduced
to form pure lead
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What is the result of lead ions being discharged?
Formation of
pure lead
at the bottom
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What is happening to the electrons during electrolysis?
They are transferred from
negative
to
positive
ions
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How do bromide ions contribute to the electrolysis process?
They provide electrons to the
anode
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What overall process occurs during electrolysis of molten lead bromide?
Electricity converts
ions
to
elemental
forms
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What are the steps involved in the electrolysis of molten lead bromide?
Prepare molten lead bromide as electrolyte.
Connect electrodes:
anode
(positive) and
cathode
(negative).
Apply electric current using a power supply.
Bromide ions
oxidized at anode to form bromine gas.
Lead ions reduced at cathode to form pure lead.
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What will the next videos cover after electrolysis of lead bromide?
Electrolysis of
metal oxides
to extract pure metal
Electrolysis of aqueous solutions
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