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Chemistry
Required Practicals
Electrolysis
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Created by
Philip Vasiliu
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Cards (20)
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?
It produces a
short-circuit
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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?
The cathode is
coated
with
copper
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Why is copper discharged at the cathode?
Because 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 during the electrolysis of copper(II) chloride solution?
Copper discharged at the
cathode
Chlorine gas discharged at the
anode
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What is the procedure for the second experiment with sodium chloride solution?
Repeat the
electrolysis
with sodium chloride
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What is observed at the anode during the electrolysis of sodium chloride?
Bubbles of
chlorine gas
are produced
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Why does the gas at the cathode during sodium chloride electrolysis produce bubbles?
Hydrogen gas
is discharged at the cathode
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How can hydrogen gas be tested after electrolysis?
By using a
lit splint
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What sound does hydrogen gas produce when tested with a lit splint?
A
squeaky
pop
sound
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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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