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chemistry
Required practicals
electrolysis P1
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Lily Weldon
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Cards (18)
define electrolysis
the
breaking
down of a
substance
using
electricity
what is an anode
a
positive
electrode
what is a cathode
a
negative
electrode
which ions move to the cathode
cations
move to the
cathode
which ions move to the anode
anions
move to the
anode
define reduction
gain
of
electrons
define oxidation
loss
of
electrons
define aqueous
a substance
disolved
in water
why must the rods not touch in this experiment
it would produce a
short circuit
if they did
what voltage would you use in this experiement and why would you not use a higher one
low
voltage is used to avoid
overheating
what would happen when you place blue limes paper next to the anode and what does this mean
it becomes
bleached
proves that
gas
is
chlorine
what is an industrial use for electrolysis
purification
of
metals
like
copper
why is purification of metals like copper important
important for producing
pure
metals
for
electrical
wiring
when electrolysis is used to extract metals from their ores why must the positive electrode be replaced
the
anode
wears away
overtime
because it
reacts
and
breaks
down
during
electrolysis
meaning it gradually
gets
used
up
and must be
replaced
positive electrode with solution copper chloride
observation:
bubbles
formed
element formed:
chlorine
state:
gas
negative electrode with solution copper chloride
observation:
bubbles
formed
+
faint
fizzing
element formed:
hydrogen
state:
gas
positive electrode with solution sodium chloride
observation:
bubbles
formed
+ smell of
chlorine
element formed:
chlorine
state:
gas
negative electrode with solution sodium chloride
observation:
reddish brown
solid forms
element formed:
copper
state:
gas