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Chemistry Required Practicals
Electrolysis
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Created by
Seth Morten
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Cards (21)
What should you be able to describe by the end of the video?
How to investigate
electrolysis
of
solutions
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Why is it recommended to watch two videos before starting the protocol?
To understand
electrolysis
of
aqueous
solutions
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What are the two aqueous solutions used in the electrolysis experiment?
Copper(II) chloride
Sodium chloride
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How much copper(II) chloride solution is poured into the beaker?
Approximately 50
centimeters
cubed
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What is the purpose of the plastic petri dish in the experiment?
To cover the
beaker
during
electrolysis
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What material are the electrodes made of?
Carbon graphite
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Why are the carbon graphite electrodes considered inert?
They do not react during
electrolysis
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What happens if the two electrodes touch each other?
A
short-circuit
will occur
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What voltage is selected on the power supply during the experiment?
Four volts
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What is observed at the cathode during the electrolysis of copper(II) chloride?
Copper
is being coated on the electrode
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Why is copper discharged at the cathode?
It is less
reactive
than
hydrogen
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What gas is produced at the anode during the electrolysis of copper(II) chloride?
Chlorine gas
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What happens to blue litmus paper when exposed to chlorine gas?
It becomes
bleached
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What are the products formed when electrolyzing copper(II) chloride solution?
Copper at the cathode
Chlorine gas at the
anode
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What is the procedure for the second experiment with sodium chloride solution?
Repeat the
electrolysis
setup with sodium chloride
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What gas is produced at the anode during the electrolysis of sodium chloride?
Chlorine gas
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What gas is produced at the cathode during the electrolysis of sodium chloride?
Hydrogen
gas
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Why is hydrogen gas discharged at the cathode during sodium chloride electrolysis?
Sodium is more
reactive
than hydrogen
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How can you test if the gas produced at the cathode is hydrogen?
By collecting it and using a
lit
splint
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What sound does hydrogen gas produce when tested with a lit splint?
A
squeaky
pop
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What are the key observations during the electrolysis of sodium chloride solution?
Chlorine gas
at the
anode
(
bleaches
litmus
)
Hydrogen gas
at the
cathode
(produces
squeaky pop
)
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